Don't get me wrong, the Ebony BLade is fully capable of killing Surtur. I'm going with Surtur because he has more appearances and he's gone up against actual skyfather level beings.
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..even the outer hells are indifferent matters for they bow only to potent and archaic Nodens.
I mean, Hulk, Thor, and Iron Man... probably aren't near skyfather level, but the fact that Bloodwraith demolished them should be feasible enough to put Bloodwraith near their level.
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yeah different levels i think but the ebony blade IS a legit threat. i dunno. weird match up. hard to call since all surtur does is generally brawl, and the sword could end him if he gets careless. surtur has good showings vs odin, but usually they brawl so....i want to say surtur, but frankly i'm not 100% sold on him here. need to see some specific feats from him aside from h2h/brawling to feel better about giving him the definite win. /shrug