Kaz’rogal is an exceptionally annoying boss in a variety of ways, not too difficult, yet definitely annoying when first exploring the encounter and attempting to discover methods around his various abilities.
Melee – 2,000 – 3,000 on plate.
Cleave – 10,000 – 12,000 in a frontal arc.
War Stomp – 15 yard AoE stun, dealing 2313 – 2687 damage and stunning for a total of 5 seconds.
Mark of Kaz’rogal – This debuff is the hallmark of the boss fight, draining 600 mana per second for 5 seconds, 3,000 mana total, and, should the player have no mana left to drain, detonate them for 10213 – 11287 shadow damage within a 10 – 15 yard radius. Will not affect players without mana.
Positioning for this fight is somewhat simple, melee set-up behind the boss and avoid his cleave, ranged DPS as well as healers will spread out widely in a circle so as to avoid detonating on a clump of players.
The primary importance of this fight lies in the conservation of as much mana as possible, even through the mana drain debuff, whether this is done through creative usage of cooldowns(mana pots, etc.) or by wearing shadow resistance gear to some degree to reduce the effect of the debuff.
The fight is largely a combined DPS race by all those without mana, rogues, warriors, etc. as well as the desire to pump as much DPS out of the ranged DPS without suffering detonation too early on, walking a fine line between early death and maximizing damage.
Beyond that you’ll find thrall and his guards to be a large aid to your efforts, often times being capable of dropping the boss a final 10 – 15% even if all but one or two players have been wiped already.
Finally, the Mark of Kaz’rogal is initially cast after 60 seconds, following this the amount of time in-between casts is reduced by 10 seconds every usage, eventually being cast continually to the point of inevitably wiping out any and all remaining mana users.