cold fusion doesn't really fit him in any way so that's kind of off the table. he doesn't like people touching him to begin with so the drawback is a net positive. the werewolf one is more what i was aiming for given his connection to animals and vague connections made between him and his family and wolf packs in general

but then the healing one is a complete inverse of his later powers as batman 666.

both healing and wolf are honestly the big draws for these feats imo

the struggle to choose