Yep im not sure what ur wearing but drums for last phase is needed and siphon weapon on an off hand aswell as leech cape is amazing for self healing also make sure to swap out stun talent for throw glaive slow last phase aswell and make sure to track add spawns with dbm too and have an immolation aura plus fel rush ready for them, I only just boosted this dh for the gimmick one shots in pvp and am playing him casually but decided to get on and try for the mog too, took about 12 attempts but is doable I would personally nerf the last phase as the hp on him without using cyclonic trinket is a bit much granted I only used agility flask and drums for haste no on use consumable.
Don’t worry though I agree with you it def needs some nerfs I got pretty lucky with my kill at the end of the day but if ur having trouble getting to last phase it’s a mechanics issue, the only part I would change is the boss not moving when u kick him on arcane so you can’t drag him to mid, that can cause an auto wipe if he is to far away when he teleports.
Siphon enchant and the leech cape enchant are needed on DH though before that I wiped 6 times on 1st phase after enchanting I didn’t die a single time 1st phase.