Darth Vader (Star Wars) vs Loren Soth (Dragonlance/Ravenloft)
Darth Vader has, through time/space travel shenanigans appeared in Nedragaard keep in Soth's throne room. Both challenge each other for information, neither are willing submit, and they come to blows. For all rounds, Soth is at the peak of his Death Knight powers.
Round 1: Canon movie Vader
Round 2: Legends vader
Win condition is death or surrender. Who comes out on top, and how close is it?