There are 2 phases.
So far:
Do not run onto stairs with hate -ever-
Phase 1:
he has a circle AOE called iron chariot
He ports, then shoots a beam for 2-3k dmg, then 4 pillars appear right after in front of him (they do dmg as well)
As tank watch for him to re-appear on minimap and run towards the direction you want him to turn (ex. away from mages). Then run behind him. He will turn a bit towards you, then you have a few sec to loop behind him
He has a 5x-attack that does some pretty nice damage
At 35-40% he shoots up fire to the sky summoning 2 meteors
Tank stays on ground. DO NOT GO ON STAIRS WITH HATE. if you go on stairs with hate he ports + 1 shots.
blms should run up the stairs to take out the meteors
Phase 2:
Same basic attacks but more hardcore
He has an aoe that hits ppl at a distance for hp and mp
There is a sweet spot to stand between his normal aoe and distance-aoe where you wont get hit
at around 50% he uses his normal AOE twice and then does a ws attack. so mages should back off and keep tank healed
if you have hate stay off stairs or he will port and 1-shot you
meteors fall significantly more often and faster (faster needs confirmation). Mages kill meteors (or brd/arc)
at 5% he disappears
golems pop and meteors start falling with higher hp than normal.
Best thing to do here seems to be 2 blms on one platform, 1blm 1brd on other platform
Meeles run to top to prevent him from regening untill he ports back down
Then you run back down and zerg him to death (after megaflare does 2000ish damage)
edit: post anything more you can think of or let me know what i got wrong and i'll update it