If you're a fan of Final Fantasy 10 and 10-2, you'd know what this is~! This is a fayth, a person merging their body into stone to become a summoned monster called an "Aeon". I thought they were pretty cool way back when I played it on the playstation2.

This one in particular is based off of the summon, Siren, that wasn't in the game.

Art©Me
Fayth©Squeenix