Easily one of the hardest fights I've done in this game, spent something like 7 hours over the last 2 days attempting him.
The worst part is that the most difficult phase is Phase 2, 4 or 5 times I managed to get past Phase 2 but not choking in phase 3 eluded me until this evening. Burning Belial in phase 2 is hard, but if you get further, relax on the DPS in phase 3, no go all out, just stay alive and he will eventually die. Also Nether Tent is OP in phase 3, burns him down so quickly without even trying.
You can see my skills in the SS below, this is completely different skills to what I used to clear act 2.
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