Abeloth vs The Darkness (Suprenatural)
Battle of the ancient female entities. The Darkness is in the weakened form as it is in Season 11. Both combatants can come back after their physical form is destroyed, but they can only do so five times. Whoever destroys the other, either completely or destroys their body five times first, will win the match.
Fight takes place on Abeloth's world.
Anyone willing to make a case for Abeloth? On reconsideration, I think the Darkness wins easily. Amara's recent feat of ripping Lucifer (and possibly killing him) out of Castiel's body while pretty badly weakened suggests to me that she could do something similar to Abeloth. it took pretty much the entire angel race to really damage her vessel, too. Not sure if Abeloth can replicate that level of power output.
She also tanked energy attacks from Lucifer without any effect (which could well be beyond anything Abeloth can send out), ragdolled Lucifer and effortlessly ashified/imploded Angels. Abeloth's Force defenses only seem to protect against Force attacks, not telekinetic attacks from other sources. But I'll be generous to her and allow her Force defenses to reduce the effectiveness of Amara's TK... if that can somehow be measured.