Discussion Merlin

[Kay3795]

kkck. With Infinity, some spells actually become multifunctional —having several functions it'd never have without it applied. For example....

Teleportation with infinity would accomplish very little.

Very little? Say what?

Think about it theoretically. Her teleporting is already something she's a master at performing but with Infinity applied to it, she's effectively able to SEAL an Individual to the bottomless pit for infinite number of years with a snap. If that person tries to get away, he must return once again to start point because Infinity, in theory, disallows it.

This means, she just performed the function of GrayLord's Cursed Chain (which disallows it's victim to exit the battlefield) but better because she chooses the location of eternal displacement.

Again I stress, mages are some of the most OP characters to have because they can do nearly everything.

 

[Aonori]

It's usefulness really depends on the specific spell more than anything. And there is also the issue that relatively small PL differences can be the difference between a spell being deadly and it being harmless. If merlin hypothetically clocked at 40k for instance then her spells at that PL would probably just tickle, say, estarosa. Them lasting longer would only mean her spells tickle him for longer, it wouldn't make them deadlier. Well, in some cases it is perhaps possible that an spell becomes deadly but it is a situational thing. Considering how broken and hax infinity is it does have some surprising limitations.

And you are right, merlin should know many more spells than most people around, including viviane. Though I don't think it is fair to compare her to melascula. Melascula is a sort of mage/wizard as well however her area of expertise seems too different from merlin's for them to be comparable. Melascula so far seems to specialize on using her darkness, meaning a comparison to merlin in this regard is moot, her helldoor ability, another point on which merlin will never be able to compare to melascula and then soul manipulation. Which I would guess is plausibly something merlin can plausibly know if she was interested. But that is still a big if.

And then we have the spells which merlin has actually used in the series so far. The bulk of what she has done would not be particularly useful if it was infinity enhanced. Going over a few... Absolute cancel times infinity wouldn't really be useful at all. Powr amplify woudn't be useful with infinity either. Perfect cube could have it's uses. Teleportation with infinity would accomplish very little. Aqua dress would be useful (but none of us wants that). The wave dragon would be useful as the dragons would last forever. But they wouldn't be any stronger for it. If this was an attack then they would disappear the moment they connect meaning adding infinity to them is a waste. The endless whirl would be useful. Fire storm would be useful if the fire remains there. Unless she can cast it and the fire keeps being generated forever. Still, for however powerful infinity actually is the spells she has used so far wouldn't necessarily become broken under it's effects.

It depends on the spell that is used, imagine she uses blizzard or something of the sorts, a infinity blizzard would take out the stamina of her oponents quickly unless they can counter, the problem here is that against merlin´s infinite duration spells if the oponent doesnt counter them quickly or catches merlin off guard with a attack it´s GG, we saw it with Grayroad, I dont wanna downplay Grayroad as a commandment she was clearly a considerable threat Merlin was just way more powerful so she got taken out easily, the fact she even tried to run just goes to prove the point of how OP infinity is, Grayroad couldnt counter it or catch Merlin off guard with an attack and her commandment was useless against her, hence why she ran, that is a proof of how smart she was.

I dont agree, if Merlin could summon a warp portal or something infinity would be extremely useful, while it´s true straight teleportation with the user and target from point A to B, wouldnt be very useful in conjuction to infinity, using some form of portal magic from point A to B, would benefit imensely from infinity but again I say this it depends a lot on what spell merlin´s using some will benefit more than others.

Lol this just reminded me of amaterasu and the fact Merlin can make her ice last a infinity is quite hax as well, I´m sorry but infinity is broken

But now seriously, if she could use spells that get stronger over time she would be insanely powerful, imagine a cyclone+fire combination for instance, or curses, enchants, etc... Merlin would be downright hax, eitherway the reason why she doesnt have many fights is because of how powerful she is, she would fodderize the majority of the commandments easy, in that regard she is just like Escanor or Meliodas.

 

[kkck]

kkck. With Infinity, some spells actually become multifunctional —having several functions it'd never have without it applied. For example....
Very little? Say what?

Think about it theoretically. Her teleporting is already something she's a master at performing but with Infinity applied to it, she's effectively able to SEAL an Individual to the bottomless pit for infinite number of years with a snap. If that person tries to get away, he must return once again to start point because Infinite, in theory, disallows it.

This means, she just performed the function of GrayLord's Cursed Chain (which disallows it's victim to exit the battlefield) but better because she chooses the location of eternal displacement.

Again I stress, mages are some of the most OP characters to have because they can do nearly everything.

I don't get what you are trying to say here. The way I see it teleportation works basically for an instant when you activated it. And once the target is at the intended destination the spell is already over. So what exactly would be extended to infinity here? What you are suggesting sounds more like a bunch of spells combined rather than infinity alone. Now, if she is able to make someone teleport back to a location after moving from it endlessly it would be broken though my first guess would be that the mechanics of teleportation alone would not allow that.

 

[Aonori]

Again I stress, mages are some of the most OP characters to have because they can do nearly everything.

Archmages are downright hax to have in any story, I played lots of games and I always go for that sort of magic classes lol, there´s hardly proper balanced competition, they can summon a lot, they can cast elemental spells, easy peasy, they can always warp reality in some way shape or form, they can teleport, use environment changing attacks, etc... if anyone played Warlords Battlecry for PC for instance and got to see the archmage class there you´d have more or less a idea of what I´m telling here, they have a huge ass spell diversity, of the level the likes of the other magicians of this series seems to be having a lot of (Vivian can even fake being another holy knight with her elemental spell acess), it´s not even funny there was also another game where I could use a sorcerer which could use telekinesis on enemies, I tell people archmage is the most haxed class to have in any sort of series, if it doesnt have proper limitations being applied and in Nanatsu no Taizai´s case there arent any, in fact it even has less limitations than games, I´m sorry but it´s factual, there arent even that many powers out there that can counter the use of magic lol we only saw like two so far, Vain and Full Counter, the rest is super poor.

--- Double Post Merged, Aug 15, 2017, Original Post Date: Aug 15, 2017 ---

I don't get what you are trying to say here. The way I see it teleportation works basically for an instant when you activated it. And once the target is at the intended destination the spell is already over. So what exactly would be extended to infinity here? What you are suggesting sounds more like a bunch of spells combined rather than infinity alone. Now, if she is able to make someone teleport back to a location after moving from it endlessly it would be broken though my first guess would be that the mechanics of teleportation alone would not allow that.

If merlin used something like a warp gate spell for teleporting, infinity would be very useful.

 

[kkck]

It depends on the spell that is used, imagine she uses blizzard or something of the sorts, a infinity blizzard would take out the stamina of her oponents quickly unless they can counter, the problem here is that against merlin´s infinite duration spells if the oponent doesnt counter them quickly or catches merlin off guard with a attack it´s GG, we saw it with Grayroad, I dont wanna downplay Grayroad as a commandment she was clearly a considerable threat Merlin was just way more powerful so she got taken out easily, the fact she even tried to run just goes to prove the point of how OP infinity is, Grayroad couldnt counter it or catch Merlin off guard with an attack and her commandment was useless against her, hence why she ran, that is a proof of how smart she was.

I dont agree, if Merlin could summon a warp portal or something infinity would be extremely useful, while it´s true straight teleportation with the user and target from point A to B, wouldnt be very useful in conjuction to infinity, using some form of portal magic from point A to B, would benefit imensely from infinity but again I say this it depends a lot on what spell merlin´s using some will benefit more than others.

Lol this just reminded me of amaterasu and the fact Merlin can make her ice last a infinity is quite hax as well, I´m sorry but infinity is broken

But now seriously, if she could use spells that get stronger over time she would be insanely powerful, imagine a cyclone+fire combination for instance, or curses, enchants, etc... Merlin would be downright hax, eitherway the reason why she doesnt have many fights is because of how powerful she is, she would fodderize the majority of the commandments easy, in that regard she is just like Escanor or Meliodas.

Yeah, an infinite blizzard would be powerful and all, same as her endless whirlwind if infinity was applied to it. But in the scenarios you are describing it doesn't sound like merlin would need infinity anyways. Did she even use infinity during against greyroad? It didn't seem like she used infinity to make the tornado and was necessarily only for a moment. Not to mention that even though infinity does make spells last forever, we have no idea of how how magic actually using infinity requires.

As for the portal... True, if she could make a portal then infinity could make it last forever. But that is a 100% different magic from teleportation.

And sure, merlin could make her ice last forever. But that is something completely different from, say, it having the capacity to trap someone forever. Say merlin is fighting zeldris. And she traps him in her ice and applies infinity to it. This only works if the ice is capable of holding zeldris to begin with as infinity does not increase the ice's strength by even 0.0000000000001%. So.... essentially infinity would be "useful" in a situation where she didn't need it to begin with.

--- Double Post Merged, Aug 15, 2017, Original Post Date: Aug 15, 2017 ---

If merlin used something like a warp gate spell for teleporting, infinity would be very useful.

So.... if merlin used infinity on a completely different spell it would be useful? Sure, I won't disagree with that....

 

[Aonori]

Yeah, an infinite blizzard would be powerful and all, same as her endless whirlwind if infinity was applied to it. But in the scenarios you are describing it doesn't sound like merlin would need infinity anyways. Did she even use infinity during against greyroad? It didn't seem like she used infinity to make the tornado and was necessarily only for a moment. Not to mention that even though infinity does make spells last forever, we have no idea of how how magic actually using infinity requires.

As for the portal... True, if she could make a portal then infinity could make it last forever. But that is a 100% different magic from teleportation.

And sure, merlin could make her ice last forever. But that is something completely different from, say, it having the capacity to trap someone forever. Say merlin is fighting zeldris. And she traps him in her ice and applies infinity to it. This only works if the ice is capable of holding zeldris to begin with as infinity does not increase the ice's strength by even 0.0000000000001%. So.... essentially infinity would be "useful" in a situation where she didn't need it to begin with.

Of course she did, how else did you expect her to bypass Grayroad´s commandment?

We only know Merlin has to pay the original magic cost for applying the spell in question, but with infinity coming in she can just cast a spell with a 1 sec duration and have it last til infinity thats why it was downright said by the other character that it was a super unfair ability, Merlin saves much more magic power if she only needs to waste her magic to cast something and nothing to keep the duration going.

Thats not the point, the idea of using infinity to it´s greatest advatange is that Merlin can use stronger magnitude spells with a higher area of eff without having to worry about the spells duration costs since it´s infinite, she can literally pay the magic cost for casting something huge in area of eff and with great magnitude and waste much less magic than lets say Vivian and Mera would on the long run because the duration is infinite and even if we assume she wastes a determined amount of magic power to activate her "infinity", I seriously doubt it would be a higher amount of magic cost than what it would´ve been if the spells duration "X" had just been paid, it seems more like she wastes less cost to activate infinity than what the actual duration of the spell she´s using is worth meaning, the rule of spell duration cost which applies to every other single character in this series including godess queen and Demon Queen is just downright ignored by merlin, I´m sorry but thats downright hax, it´s like having the merlin character work under different spell rules than the rest of the other characters, with a infinity on all of her spell durations and thus because of this she can invest more into the magnitude and area of eff of the said spells.

by this logic, Merlin can just cast a Blizzard of high area of eff + high magnitude at Zeldris, he can break free of the few ice around him as long as he wants but I seriously doubt he would be countering the whole blizzard without the Demon King´s power-up, and even just 40k were used for the spell, since the spells lasts for infinity the damage would keep going on, unless Zeldris tried to avoid the Blizzard he would have a hard time.

 

[kkck]

Of course she did, how else did you expect her to bypass Grayroad´s commandment?

We only know Merlin has to pay the original magic cost for applying the spell in question, but with infinity coming in she can just cast a spell with a 1 sec duration and have it last til infinity thats why it was downright said by the other character that it was a super unfair ability, Merlin saves much more magic power if she only needs to waste her magic to cast something and nothing to keep the duration going.

Thats not the point, the idea of using infinity to it´s greatest advatange is that Merlin can use stronger magnitude spells with a higher area of eff without having to worry about the spells duration costs since it´s infinite, she can literally pay the magic cost for casting something huge in area of eff and with great magnitude and waste much less magic than lets say Vivian and Mera would on the long run because the duration is infinite and even if we assume she wastes a determined amount of magic power to activate her "infinity", I seriously doubt it would be a higher amount of magic cost than what it would´ve been if the spells duration "X" had just been paid, it seems more like she wastes less cost to activate infinity than what the actual duration of the spell she´s using is worth meaning, the rule of spell duration cost which applies to every other single character in this series including godess queen and Demon Queen is just downright ignored by merlin, I´m sorry but thats downright hax, it´s like having the merlin character work under different spell rules than the rest of the other characters, with a infinity on all of her spell durations and thus because of this she can invest more into the magnitude and area of eff of the said spells.

by this logic, Merlin can just cast a Blizzard of high area of eff + high magnitude at Zeldris, he can break free of the few ice around him as long as he wants but I seriously doubt he would be countering the whole blizzard without the Demon King´s power-up, and even just 40k were used for the spell, since the spells lasts for infinity the damage would keep going on, unless Zeldris tried to avoid the Blizzard he would have a hard time.

I meant as in she activated it at any point during the fight. She was immune to greyroad's commandment because thousands of years ago she activated the spell to stop her time...

I don't disagree with the bold part, I am well aware of that. But we haven't really seen her use any spells where that would make that huge a difference. And zeldris has more going for him than only being the demon king's representative. Even if infinity has a marginal magic cost, activating a huge scale magic even for a second until infinity kicks in will still have a huge magic requirement. Sure, merlin won't have to sustain it but the magic cost was still paid to start it. And the blizzard is still not going to be stronger for it, it can only be as strong as merlin's magic allows. As for merlin countering a blizzard... why not? The guy is arguably the strongest commandment even without DK powers anyways. Merlin actually faced zeldris and got owned for crying out loud lol. Merlin is insanely powerful, her magic is broken but not in the way suggested here. She would have to show completely different spells from what she has shown so far along with power at least matching that of her enemy for her magic to be legitimate broken.

 

[Aonori]

I meant as in she activated it at any point during the fight. She was immune to greyroad's commandment because thousands of years ago she activated the spell to stop her time...

I don't disagree with the bold part, I am well aware of that. But we haven't really seen her use any spells where that would make that huge a difference. And zeldris has more going for him than only being the demon king's representative. Even if infinity has a marginal magic cost, activating a huge scale magic even for a second until infinity kicks in will still have a huge magic requirement. Sure, merlin won't have to sustain it but the magic cost was still paid to start it. And the blizzard is still not going to be stronger for it, it can only be as strong as merlin's magic allows. As for merlin countering a blizzard... why not? The guy is arguably the strongest commandment even without DK powers anyways. Merlin actually faced zeldris and got owned for crying out loud lol. Merlin is insanely powerful, her magic is broken but not in the way suggested here. She would have to show completely different spells from what she has shown so far along with power at least matching that of her enemy for her magic to be legitimate broken.

Yeah, she can just enchant herself and bypass a commandment´s eff, thats a huge feat.

She will still be able to cast something very strong, probably strong enough to alter a good amount of the surrounding environment if she cast it, I will tell you this by following the logic of spell casting, costs I see in games like Oblivion, which is very similar to the logic used in Taizai, casting a strong spell in magnitude and area of eff for a instant and then have it have a infinite duration there wont be much costing and here´s why, increasing the area of eff is without a doubt the one highest factor in increases of magic costs for spells, in conjunction with a magnitude increase the cost of the spell is gonna be big, but the spell would be way more bigger in magic cost if it had to deal with the duration aspect, way, way more, for each second the spell would last it would increase the cost over a lot more (because with more variables for the spell being increased in number, the variable for cost would exponentially increase greatly), but if that thing is taken out of the equation, merlin only needs to pay up magic costs for 2 aspects of the 3 while having duration already set at infinity (AKA max), how is that not a huge hax? She only has 2 variables messing with her spell costs magnitude and area of eff, and thats cheap, way too cheap if you ask me, assuming she uses her 40k just for magnitude and area of eff alone, her spells would still be insanely powerful agains

What I´m saying here is that she can cast stronger spells and with a much higher area of eff which will of course be harder to counter than what the rest of the characters can and this is factual, for Meliodas to use full counter against large scale attacks of the likes of the albion he needed to use his sacred treasure clones, all in frontal direction of the attack to redirect it, Merlin can do attacks like this easily with her power, or possibly stronger since albion is just a 11k PL, whereas Merlin is 4 times that, this is why I defend what I say then I say she´s the most powerful sin, she´s not the strongest, but she´s way more powerful than the other sins, and from all the other sins the only one I could see effectively countering her spells and overpowering would be peak escanor, Meliodas on the right circunstances can also be able to counter merlin, I think part of the reason why Meliodas fears Merlin is because he himself knows he might not be able to use full counter against all of spells, some yes, definitely, but not all, so he knows Merlin can be a dangerous foe depending on what spell she uses against him and that he would need Lost Vayne just to get around the spells with a larger area of eff.

 

[Pro Ban Corps]

And she's afraid of him, your point. I doubt their mutual fear has anything to do with power. Plus there's no clear evidence to use that as a point to merlins power, there's only speculation which isn't worth the time.

Well we can only speculate as you can't prove otherwise either .
Time wasting speculations everywhere

--- Double Post Merged, Aug 15, 2017, Original Post Date: Aug 15, 2017 ---

It says the one person he doesn't want to make an enemy of is Merlin. It could mean two things. He doesn't want her as an enemy because they are really close friends or because she is scary. Mel has no fear against her tbh. He can probably attack her before she has time to react but I can't say that 100% because we never seen it yet

As right as you are, merlin is still enigmatic so assuming Melodias can speed blitz her is just gonna start a painful argument. What if she has an infinity spell that activates when attacked or something.... the what if just goes on and on and on

 

[Gallon]

And the only way to bypass it, is either play strategic very well, or using downright hax, the fact the sins had to find away to bypass Grayroad´s commandment proves she was a mid. tier commandment who actually was a threat, I´m sorry to say this but most of the other "stronger commandments", didnt know what the fuck they were doing in their fights, Estarossa´s commandment for instance came very in handy a lot of times and was showcased, but a lot of the others hardly were, Monspiet and derriere´s way out for instance, Galan´s use of his commandment while drunk and ending up being himself petrified, etc... Grayroad had it the hardest if you ask me, being paired up with Fraudrin the lowest of the lowest and having to save his ass multiple times, was nothing but a way to showcase Grayroad as a actual threat and also was one of the few commandments to actually get casualties done in Liones, in fact he was the one who did the most secondary character casualties, out of all commandments 2 secondary characters killed because of her and I´m yet to see the other commandments do better, than just killing some fodder, so no Grayroad wasnt the weakest commandment and using wits to win in a fight scenario should be looked up upon, she shouldnt be seen as weaker for doing it, but smarter than most of the other commandments actually.

I dont see any sins except Merlin and Gowther being able to deal with the Grayroad threat without dying so yeah, we shouldnt be downplaying her feats, she was one of the most dangerous commandments and her commandment is easily the best we´ve seen so far.

That's the thing - she's tricky, but not extremely strong. Being mid-tier Commandment level is far below Meliodas and Escanor, so she's nowhere near to being the strongest sin.

Additionally, Merlin's immunity to the decrees is natural- don't overhype her. Sure, she bypassed Pacifism through stopping her own time, but that doesn't imply that she's crazy powerful considering defeating Grayroad in that state was child's play.
Plus, don't downplay Fraudrin. He only suffered that much due to not wanting to leave Dreyfus' body. In his true form, Merlin didn't really take many measures and it almost cost Dreyfus and Griamore their lives, implying a physical fighter is pretty tough to deal with when Merlin's concerned.

 

[HereNThere]

I don't get what you are trying to say here. The way I see it teleportation works basically for an instant when you activated it. And once the target is at the intended destination the spell is already over. So what exactly would be extended to infinity here? What you are suggesting sounds more like a bunch of spells combined rather than infinity alone. Now, if she is able to make someone teleport back to a location after moving from it endlessly it would be broken though my first guess would be that the mechanics of teleportation alone would not allow that.

I'm of the opinion that Merlin used Infinity on Vivian during her reveal.

 

[kkck]

I'm of the opinion that Merlin used Infinity on Vivian during her reveal.

What? when? When she teleported her at high speed to god knows how many places? Merlin seems to have sufficient magic even back then to use teleporting casually, I doubt she used infinity. I have my doubts we have ever seen her apply her magic onto other magics on screen so to speak.

 

[Aonori]

I'm of the opinion that Merlin used Infinity on Vivian during her reveal.

You are into something it seems to be the case she did that.

That's the thing - she's tricky, but not extremely strong. Being mid-tier Commandment level is far below Meliodas and Escanor, so she's nowhere near to being the strongest sin.

Additionally, Merlin's immunity to the decrees is natural- don't overhype her. Sure, she bypassed Pacifism through stopping her own time, but that doesn't imply that she's crazy powerful considering defeating Grayroad in that state was child's play.
Plus, don't downplay Fraudrin. He only suffered that much due to not wanting to leave Dreyfus' body. In his true form, Merlin didn't really take many measures and it almost cost Dreyfus and Griamore their lives, implying a physical fighter is pretty tough to deal with when Merlin's concerned.

I think I will wait to see how much that perfect cube of hers can tank from mel and escanor before arriving to any conclusion and there is very little "natural" in merlin getting away from the effs of a commandment after mel downright telling the only ways to get away from the effs of one, if you had said gowther had a like this I would've agreed but merlin? Nope.

 

[Gallon]

I think I will wait to see how much that perfect cube of hers can tank from mel and escanor before arriving to any conclusion and there is very little "natural" in merlin getting away from the effs of a commandment after mel downright telling the only ways to get away from the effs of one, if you had said gowther had a like this I would've agreed but merlin? Nope.

Spoiler

She literally says it herself.

 

[kkck]

Spoiler

She literally says it herself.

A bit of a tangent but this made me think of something. Given the new context we have on the demon king and supreme goddess (as beings capable of foderizing motherfucking meliodas and elizabeth, a goddess with power on par or above archangels) specially in regards to the curses they gave to mel and elizabeth which are remarkably hard to remove. Merlin being endowed with a natural immunity to the commandments, also curses granted by the demon king, would have the implication that perhaps her immunity was granted by a being comparable to them to begin with. Recently I begun wondering if each race has a corresponding "god"... No clue on what that might be for humans but it is not a stretch that perhaps the sacred tree at the fairy realm could have such role for fairies. As for giants... maybe there is a god of earth? They draw power from the earth after all. And escanor stands on his own among those gods as the living embodiment of the sun .

 

[Aonori]

Spoiler

She literally says it herself.

Then how exactly did galan's commandment work on merlin to begin with? I'm not even gonna go further into those waters it sounds like plot bending by nakaba, she panicked after being strucked by it but then she remembered she had a natural resistance to commandments? Yep I'm not gonna go any further into this, archmage is hax but it seems nakaba didnt knew how to properly writte one's weaknesses and improvements on paper very well (this is starting to remind me of a certain other character from another series). I will let her feats do the talking at this point.

 

[Gallon]

Then how exactly did galan's commandment work on merlin to begin with? I'm not even gonna go further into those waters it sounds like plot bending by nakaba, she panicked after being strucked by it but then she remembered she had a natural resistance to commandments? Yep I'm not gonna go any further into this, archmage is hax but it seems nakaba didnt knew how to properly writte one's weaknesses and improvements on paper very well (this is starting to remind me of a certain other character from another series). I will let her feats do the talking at this point.

It's odd, but we do know it's not all thanks to her ability.

 

[Demonspeed]

Gray Lord is underestimated. It's true that she mostly relied on her decree but it doesn't change her PL, she is able to use pure offensive attacks and since she is an evolution of Gray Demons she should have all their attacks(Dark Snow; Dark Nebula etc). If she split to run away, it's because she thought she had no chance against Merlin. Fraudrin can't be stronger than her.

Merlin can teleport, has the best defensive move in the manga so far, normal barriers, can cancel magic, absurdly high magic power, the fact that she is such a great Wizard gives her more versatility than most and there is Infinity plus Aldan's Release which is still unknown. It's not surprising that Nakaba didn't give her a regeneration/healing ability. She is rather fragile compared to most of the Sins but her defensive abilities are absurdly high. Maybe she has a chance against Escanor depending on the spells she has but Meliodas is the worst opponent for fighters like her. His physical abilities are great and he has Full Counter along with his Demon abilities.

What she needs right now is a good fight against a good opponent for more feats.

 

[Baum]

As right as you are, merlin is still enigmatic so assuming Melodias can speed blitz her is just gonna start a painful argument

Fashionably late as per usual but...

That's almost laughably easy to determine. Merlin was slower than Galan, Galan's slower than Mel. There. That problem out of the world as well.

As for the whole "doesn't want to make an enemy out of"... Meliodas and Elizabeth seem to have basically raised Merlin themselves. Of course he wouldn't want to fight her. It likely also ties into his issue with his old self because fighting Merlin would mean that he reverted back to being his self from before she was even born aka the lad who gleefully splattered Fraudrin all over Lioness Castle.
Same thing goes for Merlin. I doubt she ever saw Meliodas like that in the past but she has to know about that side of him, and I'd be afraid too if I knew how the Archangels were and that he singlehandedly kept them at bay.

 

[Pro Ban Corps]

That's almost laughably easy to determine. Merlin was slower than Galan, Galan's slower than Mel. There. That problem out of the world as well.

Against galan, merlin sensed him straight away and slander jumped in underestimating merlin. And melodias did not speed blitz galan then. Is anything he used his ST and galan still made mince meat of him. Now melodias is stronger and rah obviously faster, but merlin knows the type of strength he holds so if she's to cross him then she'd have a plan against this. Simple logic really.
And yeah from recent chapters I have reasons to believe they are quite close, so they'd know each other's strengths and weaknesses