Right-o, Lexy. [Pretty simple nickname, but it works. ANYWAY, let us dive in to the wonderful world of eres!]

And, uh, I guess using eres is kinda the same as you guys'...aer? I mean, there are some really high level eres that require eres stones to use. I can't exactly explain what those are, since that's not my area of expertise n'all, but they exist in certain monsters, mostly the really strong ones. Those stones make it easier for the eres to flow in a particular pattern - kinda like opening up a path to the eren's body? I dunno, that's how I explain it.

I mean, it's hard to explain eres, you gotta really see 'em in action, or do it yourself, to explain it.