GRUUL TACTICS: Krosh Firehand MAGE TANKED !!! all mages read this !

Health: About 301,000
Level: ??
Melee: n/a?

Casts a Spell Shield which a mage can Spellsteal. It reduces incoming spell damage by 75%, and lasts for 30 seconds.

Krosh has a Spell Shield which reduces magic damage taken by 75%. A mage must Spellsteal this to remove the Spell Shield from Krosh and protect himself from Krosh's fireballs and must also and maintain aggro with modest DPS. The only exception to this maintained aggro is that it is a common strategy for Warlocks who are Enslaving Olm's Wild Fel Stalkers to place them on Krosh to have them disposed of. The mage (and the entire raid for that matter) should be running a threat meter (Omen) and you'll find that it doesn't take that much dps to maintain aggro even with dps-impaired gear. This is an important detail for mana management so the mage need not be casting full-time until such time as the raid focuses on Krosh to down him.

All mages taking on the task should study the list of mage stamina gear
http://www.wowwiki.com/List_of_mage_stamina_gear

and the Krosh Firehand strategy page .
http://www.wowwiki.com/Krosh_Firehand

The stamina gear page has tables of useful mage gear and other important information on how to prepare before the raid and the Krosh page contains detailed mage tank strategies.

The mage tanking Krosh should have upwards of 12,000 HP when buffed, a good amount of spell hit, and a decent mana pool. The tanking mage should gear for stamina until he reaches a minimum of 10500 health unbuffed (13k is more ideal). Spell Hit is critical and the mage should be near the full +16% spell hit (202 rating) to minimize the chance of having Spellsteal resisted.

With 5 points in the Arcane Focus talent you would need just +6% spell hit (75 rating) from gear. Mana should not be disregarded, as repeated Spellstealing is costly (29% of your base mana). Spell Damage and Crit are good too but are lower priority, as again, it doesn't take that much dps to maintain aggro.

Important Notes:

Casts Blast Wave AoE which deals roughly 6000 damage and has a short range (15 yard). No one should take Blast Wave damage. No one is to go near Krosh, nor any pets and should be downed entirely with ranged DPS. The only exception to this is with Warlock Enslaved Wild Fel Stalkers in order to dispose of them.

He is immune to almost all debuffs: Curse of Tongues, Counterspell, Silence and his Greater Fireballs ignore fire resistance gear, grounding totems and spell reflections.

Paladins should ignore their instincts and not put Blessing of Salvation on the tanking mage. Blessing of Kings or Blessing of Wisdom are ideal. Blessing of Light is a good idea if a pally is going to do the healing.

An Elemental Shaman can be very beneficial to the tanking mage when Totem of Wrath and Mana Spring Totem are deployed in his vicinity.

Hunters should be reminded NOT to use arcane shot while attacking Krosh as this will dispel his shield, preventing the mage from stealing it.