Board Thread:Questions and Answers/@comment-35689795-20180822220559/@comment-36309590-20180823175835

Fenris would win due to being 1. An Archdemon and 2. Soulless (immortal) unless Nexus has Demonic Slayer (which Fenris is weak to) she would not be able to kill him. Well maybe if you became omnipotent/nigh-omnipotent.