Overall

Phase One:

Gather up, have one designated ranged DPS shoot down the frost orbs above to form permafrost on the ground. The boss must be tanked facing away because of a frontal cleave.

Nerubian Burrower adds will spawn in phase one and they stack an Expose Armor debuff on their tanks, up to 10 stacks which increases physical damage taken. These need to be tanked on the permafrost or else they will burrow and heal back to full. The raid should have 2 off tanks (on 25 man) to pick these up. By the time Anub'arak burrows, there should only be 4 of them up; 2 on each tank. They should be killed during phase 2, when the raid has nothing else to do. For groups with only one tank for the burrowers it is advisable to just kill them else expose armour will stack to absurd levels (+500% damage taken) with four Burrowers on one tank.

Phase Two:

Anub'arak will burrow approximately every 90 seconds, staring phase 2. He will pursue a random target with spikes throughout the phase and when he reaches them he will cast Impale. The spikes will gradually speed up until they hit the target, or hit a patch of permafrost. Standing on the permafrost will enable you to avoid the impale, but the permafrost will despawn. After a few seconds, he will select another target.

Swarm Scarabs will spawn rapidly, scarabs have little hp but stack the same stacking nature damage debuff on their tanks, should be range kited and killed with AoE damage. After about one minute Anub'arak will surface and begin phase one again. He keeps threat from phase one.

Phase Three:

It is advisable to kill off any adds currently active before pushing Anub'arak over 30%. He will not submerge or summon any more adds at this point. Anub'arak needs to die very quickly after hitting 30% as you will not last long under the effects of leeching swarm. It is not ideal to top off raid members as they will then be taking full damage from the leeching swarm, healing Anub'arak and prolonging the phase. Instead you will want to keep people at ~5,000 HP (Hard mode ~9,000) so that they do not get gibbed by penetrating cold while also minimizing the amount Anub'arak heals (Anub'arak will be being healed for ~60,000 HP a second if the entire raid is at full HP on 25-man mode). Tanks and people with penetrating cold will need spam healing. Anub'arak does not have any other tricks and will die upon reaching 0% HP.

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