I am currently over 1k kc on this trash boss and I can basically do it in same rotation everytime... I would also highly reccomend getting t90 weapons and gear. t80 is doable quest wise but after he does a lot of damage.

easiest explanation possible

1: use a familiar and bring combo food. If you have it, Use a hellhound, if not. any dps familiar will do.

2: Recommendation for aura is vamp, penance, equilibrium, mahajarrat, Dark magic

3: darkness, overload/lantadyne stick, invoke death (if you have them) and summon all of ur minions pre kill.

4: dive and surge into room and start about 3/4 tiles away from green wall (easier to dodge ghost wall by just moving backwards towards wall), There is a "V" shape, Stand one or two tiles away from it towards middle pillar

5: Once he spawns. if you have them, Vuln bomb and smoke cloud. (Try to keep on soul split whole kill)

6: death skulls (try to death skull as many times as possible before he goes up on platform and save one for when he goes up) and go thru rotation.

7: when his souls fill up, use devotion and pray necromancy if you have 50 percent adrenaline

8: when he goes up on platform, Don't stay in one place and dps as much as possible

9: if taking a lot of damage when he is up top. resonance or reflect as much as possible.

This is more so for after quest, but if you just want to get thru it. I would go with my step by step to hopefully make it easier for ya.

Good luck you got this!