Anubisath Sentinels
Attacks:
These come in packs of 4 mobs inside Ahn'Qiraj. They have a normal attack as well as one of the following abilities:
Renew (Heals 4.5K every 3 seconds) (Use Mortal Strike)
Mortal Strike
Mana Burn
Multiple target Shadowbolt (Likely the worst)
Knockback [Immune to Taunt
Thorns (500 damage)
Thunderclap (no debuffs though, 800 damage)
Reflect Fire and Arcane Damage (You can tell since it bounces back detect magic)
Reflect Frost and Shadow Damage
When any one sentinel dies, the remaining sentinels gain the ability of the fallen sentinel and are healed for 50% of their max health. This means the last sentinel will have 4 abilities.
Obsidian Eradicators
Attacks:
They pull singly. They can drain mana from all mana users in range. It seems that they choose 16 candidates to drain mana from as soon as aggro is aquired. They will cast Shock Blast on everyone in the zone (6.5K damage) if their mana is allowed to reach 100%, so they must be drained of their mana with Mana Burn, and Drain Mana. Viper Sting is not recommended as a mana drain, because it will take up valuable Debuff real estate, even if you only have 3 warlocks and 3 priests draining his mana. Viper Sting is simply not needed.
Strategy:
A highly recommended strategy is to have 3-5 Warlocks using Mana Drain, and 3-5 priests using Mana Burn while one or more druids heals the main tank. This enemy does not hit hard, and the main tank doesn't require much healing. Everyone else in the raid who is not healing or draining mana should be doing DPS.
Qiraji Brainwashers
Attacks:
These can Mind Control and cast Mind Flay with an added fear effect. The come in packs with the Vekniss Warrior, they really should be killed first as the Gaurds are not really special, but the Brainwasher are what pwns raids.
Vekniss Warriors
Attacks:
have no significant special attacks. However when they die they release about 10 Vekniss Borers.
Vekniss Borers
Attacks:
They spawn in packs of around 10 for each dead Vekniss Warrior. They hit plate for about 200-300 damage.
Vekniss Gaurdians
Attacks:
When one of the Guardians in a pull die, the remaining guardians charge toward their fallen comrade, impale (stackable DoT), and knock people beside the corpse into the air.
Vekniss Soldier Packs
Attacks:
They have no notable special attacks, but they respawn extremely fast. The drones have very low health.
Vekniss Wasp Packs
Attacks:
These are groups of three-four mobs located in Temple of Ahn'Qiraj just before Princess Huhuran. They come in a few different flavors.
Each group contains two or three Vekniss Wasps, a Vekniss Stinger, and/or a Qiraji Lasher.
The Vekniss Stinger is similar to the Hive'Zara Stinger in Ruins of Ahn'Qiraj, except naturally much more deadly and cannot be rooted.
The Vekniss Wasps are also quite similar to the Hive'Zara Wasps in Ruins of Ahn'Qiraj, except again naturally much more deadly and cannot be rooted.
The Qiraji Lasher is similar to the adds accompanying Battleguard Sartura except that they cannot be stunned.
Vekniss Drone
If you are not careful you will get knocked back into these during the boss attempt. Two words: Very Squishee.
Vekniss Hive Crawler
Attacks:
They use extremely high damage instant poison, mind numbing poison, and crippling poisons. The poisons must be cleansed immediately.