Summary:
Avoid the Blue Fire, strafe when it is headed towards you.
Kill the Bone Spikes as they appear, have enemy nameplates enabled to see them fast.
Tanks should allways stay grouped to divide damage from Saber Lash. Don't forget about this aspect when pulling or after the Whirlwind.
Run away from him during Whirlwind.
Watch your threat after Whirlwind, (it’s a threat reset).