Dormammu
vs
The Octessence: Cytorrak, Balthakk, Watoomb and others

They say an otherworldly dimensional being is the supreme power in their home dimension. Obviously, there are limits to this general rule, as when Galactus started to consume Mephisto's Hell. Taking it up a notch from Mephisto and let's say it's Dormammu who's in his home dimension. The Octessence, as a unified team, decide to invade the Dark Dimension and divide it up amongst themselves after the battle, they plan to lay down a beating on Furnace Face. Dormammu is unaware of the invasion until the Octessence magically appear in his dimension. How would the battle go?

PS. The Mindless Ones are not in the battle.