Anubisath Warder

Anubisath Warders are level 63 elite Anubisaths found in the Temple of Ahn'Qiraj.

Overview
After killing the Twin Emperors there are several trash pulls that must be completed before attempting Ouro, C'Thun, or turning in weapon quests. The last 3 pulls consist of 1 Anubisath Warder and 2 Obsidian Nullifiers.

Abilities
It seems that all Anubisaths follow the same strategy: random abilities are chosen at the beginning of combat. It will choose 1 ability from each of the following sets. The Warder will reset its abilities if the raid wipes.

Set 1: Root or Fear
 * Each affects a large quantity of the raid, ranging at least 30yards from the mob and happens randomly.

Set 2: Dust Cloud or Silence
 * Dust Cloud Reduces chance to hit by 85%. Since these are level 63+ mobs, this essentially stops all melee damage.
 * Silence on the other hand stops all casting.

They also have a Fire Nova, which is a large factor in wiping when used with Obsidian Nullifiers Nullify

(Note: They do not seem to reflect any magic, nor have a special ability at 10%)

These mobs may have been changed recently. On 10 May 2006 an Anubisath Warder was encountered that had both Root and Fear at the same time. And on the 18th of August an Anubisath Warder was encountered that used Root, Fear, Dust Cloud and Fire Nova.