Preferable raid setup as on Anduril Realm:
one shaman and one paladin for each group for fire resistance aura and totem
healers 2+ just in case,at least 1 should be priest for mass heals
Fight:
The tank turns him,dps attack from behind in a safe distance to prevent any harm done from Cleave: Frontal Cleave ability, hitting up to 5 targets for his melee damage plus 2000(normally it should hit only targets infront of him,but it`s kinda buggy on Anduril) .Range should be mele,but a bit far until skill use becomes impossible aka when u see "Out of range" msg.
He casts Rain of Fire:15-yard AoE cast on a random target within 30 yards. Lasts 10 seconds and deals 1619-1881 fire damage every 2 seconds. the group on which it falls upon should move and leave the spell effect area till the effect is over.
The other spell u should watch out for is Howl of Azgalor: 5 second zone-wide AoE silence with 15 second cooldown. Can be resisted with shadow resistance.I`s not a must but healers might want to use
Medallion of the Horde which can prevent a wipe when there`s a need of emergency heal while the healer is silenced.
Well that`s pretty much it.Just follow these simple instructions and there will be no problems.If all stick to this even 1 healer can be enough and also shammy or pally wont be a must for the group.Ofc this counts only when there isn`t big lag and ppl can react on time.