This is based off the logia powers in one piece, which are way op at the start of the anime toned down to better fit HC. Instead of a full body elemental transformation I was thinking it would be localized to one limb. Like you could turn your arm to fire, or leg to ice. It's toggleable, not always on fire. Potentially require protection from fire if you have a fire/magma arm/leg. Or it could be magical and not burn yourself with it. Potential elements Fire, Ice, Water, Magma, Diamond, Snow, Lightning, Shadow, Light, Sand, Rock, Metal(iron?), Could be manipulated by the proper control element, unlike wood control on a deku as that's its actual flesh and with this active your actual flesh is replaced by magic with an elemental limb. These limbs would be able to do basic elemental attacks, throw fireballs with a fire arm, a wave of flames from a kick, etc
So looking through the library I saw that 3 versions of this already exist in a way. Cowl of Cold, Gale of Gears, and Frock of Flames. So maybe we should just come up with the variants for the other elements. While the three mentioned are associated with the Goddesses, the others could be associated with the Great Fairy of (Insert Element Here).
