Wayfinder Talon of Pyre
Bossfight with Talon of Pyre.
I died 2 times, so skipped to second part :D
Wingrave build:
https://i.imgur.com/N5jqk8M.png
https://i.imgur.com/g6wMq4o.png
2h Sword,
7k+ weapon power
High defensive stats
Mastery: +40% break armor
How to fight: avoid big AoEs, block simple attacks.
Last phase 60-70k - Burst it while healing or in bubble, its a DPS race who will die first.
If you fail to kill quickly - boss will be vanished with no loot