I agree, it's just Mashima things, which was what I was saying lolSure, but the manga itself is fairly inconsistent. For example, Erza got her ass rekt by Ikaruga, ended up oneshotting her.
Fukoro was similarly fucking up Gray, got oneshot.
Racer, fucked up Gray, but was getting fucked up Jellal, and yet.... Gray oneshotted Racer, and Jellal didn't oneshot Racer.
Eileen probably just isn't a particularly durable dragon. That, and Mashima likes to play loosely with his rules. Sometimes slayer advantage means everything, like with Mard and Eileen. Sometimes it's just a useful boost, like with Cherria and Dimaria.
On bold part.
I would've considered that argument, if it didn't happen to Mard as well. The guy tanked blows from CSK in base with no issues, no sold LFD Natsu and twin dragons in base, pretty much no sold DF Natsu amp'd on POF. And yet got one shot by Gray using demon magic.
But I'm 100% sure Mard won't get one shot by another demon of his same tier.
Acno and Igneel had an extreme diff battle. They traded several physical blows, many of which I'm sure they didn't counter/defend well.It is super effecitve. Compared to everything else.
Oh, I believe dragons can one shot other dragons on the same level. Humans on the same tier can oneshot each other too, and even oneshot characters that are potentially stronger than them... So why not? I imagine that when fighting other dragons, most dragons will actually use magic to defend themselves. Against humans, they just face tank whatever gets thrown at them. That's probably how a lot of dragon slayers managed to get kills against dragons in the civil war.
Humans on same tier can't one shot each other for the most part as well. Only exceptions like the typical Spriggans, who are high mp and hax with trash physical stats
But yes, I see where you're coming from. You're arguing that dragons simply consider humans too weak and don't put up their defences, hence get one shot? But there is a problem with that argument - that would be like arguing a child dragon one shots an adult dragon because the adult dragon didn't put up his defences. Assuming child dragon and human DS use the same dragon magic.