Currently playing on Xianxia v0.8s7
A few days after becoming the new Fenrir, I began to lose massive amounts of HP with every action I took, even outside of combat. I specced into a pure tank build, and at level 69 I have a max HP value of 243,000. I lose around 40K each time I move in the menus.
Because I'm Fenrir, it's impossible for the bug to be caused by any sort of interaction with being a Chimera
EDIT: After testing, the damage bug only occurs after becoming Fenrir, even the same character doesn't suffer from the constant HP drain