Thread:MockingJester/@comment-30014014-20180324234030/@comment-27950421-20181019021402

The spell used is a monsterization spell or some similar form of nymphomancy, however it's used in conjunction with another branch of magic called teletomancy which is a branch of magic based around expanding the range of a spell.

Basically Teletomancy is used in conjunction with other spells to turn normal targetted spells into massive AOE spells.

Teletomancy however takes an enormous amount of mana to use. However the mana can't just be dumped into the spell all at once, it has to be trickled in at a steady rate, thus while high order mamono can supply the necessary power on their own, it still requires a degree of magical skill and a lengthy ritual to pull off.

Teletomancy is also how Ryu do their whole, summon rain thing. It's a much smaller spell augmented with Teletomancy to massively increase it's area of effect. So if you ever wondered if a Ryu could summon a tiny rain storm to hover over someones head, the answer is probably yes.