Btw, one thing is not entirely clear to me. From what I've read, Exis can surround themselves with some kind of a force field in which they can only be hurt by other Exis. But are they constantly surrounded with that field or do they activate it as they like is not that clear to me. If it's the second, they could be killed if they don't use that field.
Maybe I'll look into it again.
According to the
wiki, it seems they have to create said space:
Every Exis has the power to generate a space around them, in which they can use a unique power that cannot be denied or negated. Under the specifications of this ability, Phantaminum can control some aspect of reality within his own field. Phantaminum's power, however, is unknown. Exis primarily have the ability to control the reality of a finite amount of space around them.
Sadly, this info has no reference. But if we take it as true, I think the purpose of this space is
just to allow the Exis to use his exis-powers within that space. The
"body" of of an Exis still can't be effected by a non-Exis, even without the space. However, in order to use your exis-abilities, you have to create said space. For instance: Enryu could throw everything in his arsenal at a sleeping Phantaminum (without an active space) and nothing would happen. On the other hand, Phantaminum may be unable to kill Enryu without the space, but the instant he creates and surrounds Enryu with it, is the instant where Enryu dies. That's how I would put it. I doubt a non-Exis can kill an Exis just because the space doesn't exist.
I had a theory, but I'm not sure if I posted it here. That Phantaminum went into Tower to become a normal person again. I imagine being an Exis has it's faults. Phantaminum seems to be some kind of a warrior. Imagine what kind of empty life Kenpachi would have if he couldn't even be wounded. Since the Tower can make all wishes come true, maybe that's Phantaminum's wish - to be vulnerable again, since he can't find any joy in fighting now. And other Exis who could hurt him are rare since he was said to be among the 5 strongest, or something similar.
Funny thing is that this theory of yours can't work,
if your assumption above turns out to be true and vice versa. There is no need to enter the Tower to become vulnerable again, if your vulnerability is affected by that space which you can turn on and off. Furthermore, I don't think Phantaminum needs/wants to climb the Tower. The impression I got from Exes and Phantaminum himself makes me assume that he can do whatever he wants in this world, literally. But I also think he entered the Tower as a human and not an Exis.
Regarding the OP's question:
Exes sure are mysterious beings and I would like to know more about them/Phantaminum. However, I don't want them to affect this series. An appearance of Phantaminum is welcome only if he tells some stories or gives information about the Tower. Plot-wise they are/would be boring and that's why I'm contra to Baam becoming one, just like Razh said.
