Anub'Arak

From wow.incgamers.com

Anub'Arak is the final boss in Azjol-Nerub, a 5-man instance in Dragonblight. During the fight, he summons Carrion beatles which do damage to players, and Locust Swarms which slow movement speed by 40%. At 75%, 50% and 25%, he burrows underground, becoming immune to damage, and causes spikes to pop up through the floor, throwing players into the air. small mounds appear just before the spikes come through, so it is possible to avoid damage if acted quickly upon. Also while buried, Anub'Arak will summon other mobs to attack players. These must be killed quickly.

You can see a video of the full fight here.

Loot

Normal Difficulty

[Unknown Item: Charmed Silken Cord]Cloth Belt
[Unknown Item: Signet of Arachnathid Command]Tanking Ring
[Unknown Item: Wing Cover Girdle] Mail Belt
[Unknown Item: Anub'arak's Broken Husk] Quest Item

Heroic Diffculty

[Unknown Item: Sash of the Servant] Cloth Belt
[Unknown Item: Crypt Lord's Deft Blade] 1-Handed Melee Sword
[Unknown Item: Frozen Orb]