Umar still has some of Eternity's power per official guidebooks, so Surtur gets thrashed at 12. Gets curbstompded at 13 regardless, Dormammu these days could theoretically simple cut off his power since has control over all magic(Albeit I find this case unlikely) as T.Hothran or depower Surtur to a lesser status like did with an ascended Ancient One who became one with the cosmos and as powerful as Eternity. Surtur's also lacks any decent speed feats and doesn't have feats to resist abilities like BFR.
I personally believe the difference in power between Dormammu to the likes of Surtur/Odin will become more apparent in Waid's series, especially because Dormmamu and a supposedly new mystical charged Galactus will encounter each other and might even fight before fusing into a version described as the most terrifying ever in issue #15.
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