User blog comment:Kajune/Why did Lucifer come back?/@comment-26982641-20160227144824/@comment-31214924-20160228080139

I think Rowena's spell made him weaker ,since it affected his sanity and being a spiritual entity his state of mind would influence his strength (but that's just my opinion).A semi-proof i have for my belief is that when under the spell Castiel couldn't easily kill that girl he was following ,plus he is getting his ass kicked all over the place and the Darkness commented on how much of a mess he is.