Dormammu isn't really like Shuma or some principality who's omnipotent in his own dimension...although I think he does usually gain some significant advantages over his opponents when fighting in the Dark Dimension.
Dorm's feats are all over the place, so that could make it tricky to call since there's not alot on Arishem, but if we're looking at both characters based on their original power levels, I'd say Dorm absolutely takes it in the Dark Dimension. He basically blew up eternity the one time he interrupted his fight with Dr. Strange, and I'd place Arishem around Galactu's level, not enough to handle Dorm on his home turf.
On Mercury, hmmm, I'd still probably give it to Dorm, but I'm not sure how crafty Arishem is. I remember Dormammu leaving the dark dimension in a Guardians of the Galaxy comic, and although he basically lost to PIS, he was fighting Ghost Rider, old Dr. Strange, and Phoenix Force and kicking ass outside of the Dark Dimension, at one point the damn Phoenix Force blasted him and it just singed his and alittle...although that was a garbage issue IMO, and there could be important story context I'm forgetting.
Wait...hmmm, can Arishem seal off dimensions himself? If he can, he'll vaporize Dorm after sealing off his power to the DD, without the flames of regency Dorm is fairly weak.
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