The key to victory is to kill him fast as he will spawn more and more adds during the fight.
It is possible to aggro the graves accidentally so you should not stand near them after engaging Zum'rah. It is also possible that you can prevent the adds from spawning by stunlocking him. It is also recommended that you take out the totem that he drops.
A lot of groups practice opening the graves near him on purpose. If you open the first 5 or 6 graves, not many Zul'Farrak Zombies will spawn, 1 or 2 max. However, if the group doesn't have time to do this, keep in mind that the zombies are fearable and encourage priests/warlocks/paladins to use it.
- How dare you enter my sanctum!
- [Troll] T'eif godehsi wha!
Players should also note that Witch Doctor Zum'rah is not guaranteed to drop a rare (blue) item and will in many cases only drop one or more common (green) items.
- Patch 1.3.0 (07-Mar-2005): Witch Doctor Zum'rah's loot table was improved.