Ice is part of water, yeah. You mix a little earth into it to make it stable.

[Personas do have an odd element system, Sync will agree with that. He nods at her words]

If not controlled, it'll just obliterate everything, including yourself. Or possibly just teleport you half-way across the planet and make you pass out for a few hours in a monster infested region. It's not something people use lightly, Seventh is mostly used for healing.

[Unless you're a certain pair of redheads anyway, then you give your teammate heart attacks by using them for arbitrary reasons or in your mystic artes]