Relevant Talents used:
From Darkness, Comes Light
Too lazy for music this time.
There is something quite strange about this boss. He attacks fairly aggressively at the start but seems to run out of steam after 1 minute, which makes this boss soloable.
After one minute he only seemed to be casting the occasional fire aoe attack, Flame Pillars and Mangle. Mind Sear was used to deal with the adds spawned from the Flame Pillars and for Mangle, use a cooldown such as Dispersion or VE during when he starts to melee attack while still being mangled.
The enrage timer isnt actually that tight. I simply fumbled around a bit.