Who wins? 
Dumas!Nightmare has straight up been stated to be pathetic compared to the original.
He gets annihilated.
Yeah it was a known plot point that Dumas!Nightmare is so pathetic, Tira wasn't even working with him due to that.
It's also why he was so easily disposed without even needing Soul Calibur.
It's also why he was so easily disposed without even needing Soul Calibur.
And replaced by a girl.
He would rather rule than destroy the world.
Dumas!Nightmare has straight up been stated to be pathetic compared to the original.
He gets annihilated.
What about Pyrrha vs Siegfried Nightmare?this cui version of a nightmare, got stomped by zwei
later pyrrha became the new user of soul edge and got also cui'd by patroklos