[RWBY VS Fairy Tail] Salem VS Zeref. Battle of the cursed immortals.

Setup : Alvarez invades Salem's dark kingdom. The Spriggan 12 fight against Salem's followers and her near-endless army of Grimm, while Zeref challenges Salem head on. Both immortal, ancient wizards who have mastered many forms of Magic in their respective universes.

Can there be a clear winner here, or do we have a stalemate?

Even if one is stronger than the other, do they have any ways of bypassing each other's immortality?

RULE : No Fairy Heart Zeref. No time hax, any of that, just base Zeref. Salem would have nothing to compete with Fairy Heart, so to make this as fair as we can, Zeref cannot access Fairy Heart for this battle.

Who wins?