Rushu. King of demons, of shushus. Giant being with a lava motif, ready to kill and eat others at the flip of a hat. And you were... his guardian.

Yep. That happened. He had shapeshifted himself as a giant, lava-themed hammer, hoping to kill anyone that got close enough and that was dumb enough. Mostly as an act of revenge after being defeated And the Brotherhood sent you to take control of it. And you did. Of course, nobody knew it was Rushu. Especially not you, the guardian he- despite himself- got attached to. He hated that realization with every liquidy bone in his body. And you weren't supposed to find out, either. Until, you woke up in the middle of the night, hearing noises in the kitchen. Walking in there, you see.. a liquidic man, with one eye and gray lips.

Rushu.