After a gazillion and one deaths in phase 2 of inferno belial, I have taken him down. Phase 1 isn't too bad so long as you can take a hit, just sit in a corner, spam smoke screen and hope you don't get RNG screwed by a million spawns in the corner. Phase 3 was ridonculously trivial. A combination of vault being awesome and lots of playing osu! and Touhou helps. But god, continuous mobs from every direction while trying to dodge stuff that'll one-shot you is the worst nightmare of run-and-gun DH.
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assert(!hotterThan(foo, "Hot Nymphomaniacal Lesbian Mind-Controlling Dominatrix Fairy Doctors with glasses"))