Gruul's lair

King Maulgar

Taken from wowwiki.

Abilities

Single target damage is around 4000 on plate
Arcing Smash, 5000~12000 damage on plate
Whirlwind, 7000 damage on plate
At 30%, he will begin charging random raid members

Council Abilities

Krosh Firehand (Mage) - casts a Spell Shield which a mage can spell-steal. It reduces incoming spell damage by 75%, and lasts for 30 seconds. Note that Krosh will only recast Spell Shield when he isn't casting a (4s cast) Greater Fireball. This means that the tanking mage's Spell Shield can fade, and he must take one full damage fireball before he can steal another shield. Greater Fireball hits for 8500-9500 damage. The tanking mage should gear for stamina until he reaches a minimum of 10500 hp buffed, more is better. Mana should not be completely disregarded, as repeated Spellstealing is costly. Krosh also casts Blast Wave which deals roughly 6000 damage and has extremely short (~10 yards) range. No one should take Blast Wave damage.
Olm the Summoner (Warlock) - casts a heavy shadow DoT, summons felhounds, and will occasionally death coil. He should be tanked by his own Felhounds. (via enslave) Olm will place a stacking debuff on the Wild Fel Stalker that must be removed by the pet, which is an ability that is not auto cast but on a short cooldown.
Kiggler the Crazed (Shaman) - has an occasional AE knock-back that deals roughly 2.5k damage. He typically attacks with ranged lightning bolts and may be tanked by a hunter with good stamina and NR. He will sometimes Hex his primary target, so 2 tanks are preferred. He does not have a lightning shield as has been previously reported. Alternatively you can use a druid to tank Kiggler since druids are immune to the hex.
Blindeye the Seer (Priest) - casts a huge AoE heal that is interruptable. Can Power Word: Shield himself before cast the heal and can't be interrupted when the shield is up. Typically tanked by a warrior.

Strategy

The key to get into this fight is the pull. Everyone needs to stand in the correct position to minimalize the impact of the area-effect abilities. The typical kill order is Priest, Warlock, Mage, Shaman, and finally Maulgar. Priest and Warlock can both be focus-fired by melee and ranged together, so they go down quickly. Shaman and Mage are ranged-only DPS and die more slowly. Due to many of the ogres having anti-melee damage (fire nova, AE knock-back, maulgar whirlwind), ranged DPS is more of an asset than melee DPS for this specific fight.

The mage tanking Krosh Firehand should place himself completely to the right and move straight forward. Just in front of Krosh Firehand there's a slight "clip" and that is where you should stand before the pull takes place. Be sure not to move too close to the "clip" or you will aggro the room. A good reference point can be used just before the clip, there is a portion of the wall to your right that makes a "corner" that is a safe reference point stay at when preparing for the pull. When High King Maulgar gets aggro'd you shoot any instant-spell you have (fire blast, PoM pyro) at Krosh Firehand and spellsteal his shield immediately afterwards. Positioning Krosh is easy. When you aggro him, he will run to you until he is right next to you, then he will stay at that point and fireball you. Make sure that you position him in the far right corner so the raid does not have to worry about the flame wave ability. This is easily done by running to the corner after a fireblast and just waiting until he gets to you and then blinking to get out of the range of the flame wave.

High King Maulgar gets pulled to the other side of where he's standing. He remains all time of the fight on his position. As for Olm the Summoner, the warriors and the warlocks run straight to him, but beware of the Blastwave of Krosh Firehand. He should be tanked in the back of the room. Kiggler the Crazed can be tanked by a combination of two hunters or two warlocks who are siphon life/drain tanking him. Alternatively he can be tanked by a moonkin druid because of the immunity to polymorph. Blindeye the Seer has to be pulled in the way of the entrance. Warriors and other melee are on the Priest doing damage.

It is important that you have enough damage to make Blindeye the Seer's shield disappear. Have someone giving information when the shield is up and then just burst his shield down. If the shield is down, just interrupt his healing ability. You should only have to deal with two or three shields while damaging him down, then all the melee should go to Olm the Summoner while all ranged DPS concentrates on Krosh Firehand. While you walk to those two encounters, make sure to avoid Krosh Firehand's Blastwave. Stay calm, be cautious, and bring those two adds down. Once Olm the Summoner is down, Krosh Firehand should follow right after. Finally everyone ranged DPSes Kiggler the Crazed down.

After all 4 adds are down, ensure your healers have enough mana. All free healers should recover some mana before entering the fight against High King Maulgar. Same goes for caster-DPS. High King Maulgar hits very hard, but his damage can be mitigated by around 30% if Curse of Weakness is kept up on him by a warlock. Melees don't enter the fight right away, they have to wait until High King Maulgar does his first Whirlwind. When the Whirlwind vanishes you can enter the fight for about 25-35 seconds, then you should move away to prevent his Whirlwind from hitting you!

At around 30% High King Maulgar starts his random charges and if you're unlucky the whirlwinds wipe the raid. Your main tank has to give everything to bring High King Maulgar back to his position. He isn't untankable, but he is unstable! At this time just DPS him down, it shouldn't take too long.






MOVIE:
https://www.youtube.com/watch?v=_QuRo81l8Ec