Well, to be fair, Devan kind of brings it on himself. You know, the whole galactic conquest and universal domination thing doesn't sit well with a lot of people, and that's not even mentioning the whole can of worms with the time travelling and possible annihilation of the space-time continuum factor. I'm sure if Devan just kept to himself and read his Star Wars novels like I do, he wouldn't be conquered all the time.

And besides, we make it convenient for him. We fight him in Hell, and if he dies, he doesn't have to make a long trip.