Imo this boss have to be changed / nerfed.
Self heal amount or hp pool must be reduced.
Tried it 2 times on Fury and never got under 98% before people left raid or gave up.
This boss have a self heal ability which many people dont understand, and there will always be someone in raid who dont read chat or understand what is written in chat.
This means the bossfight will last for hours or never end at all.
No fun