Lord Jaraxxus is a fight with relatively simple mechanics but a lot of damage (requiring good healing). Jaraxxus himself should be tanked in the center of the room, with ranged and healers set up in a wide circle. Spread healers evenly to avoid having large areas that are out of healing range. Fel Lightning, a chain lightning ability that increases in damage with each hop, can be very dangerous if the raid is not spread out. In order to reduce tank damage, Fel Fireball should be interrupted. Fire resist aura also helps reduce incoming damage.
Every 60 seconds, Jaraxxus alternately spawns a Nether Portal or a Fel Volcano. Nether Portals spawn a Mistress of Pain, while Volcanoes spawn 3 Felflame Infernals. Both types of adds must be tanked and nuked down by ranged as fast as possible. Melee should stay on the boss.
Jaraxxus will randomly cast Incinerate Flesh on one raid member. This debuff absorbs all healing on that target until a certain amount of healing has been done (10-man: 30,000; 10-heroic: 40,000; 25-man: 60,000; 25-heroic: 85,000). Healers need to react quickly: if the debuff wears off, the target blows up, causing a Burning Inferno to hit the entire raid for large amounts of damage over time.
The other debuff which Jaraxxus randomly deals to raid members is Legion Flames. This continuously spawns flames under its target for six seconds. The target should run away from other raid members (towards the room wall) while remaining in range of healers.
Lord Jaraxxus will also occasionally give himself 5 stacks (25-man: 10) of Nether Power that increases magical damage dealt by 20%, totaling 100% (25-man: 200%). Mages should Spellsteal this buff as it will increase their DPS and reduce Jaraxxus's damage. If there are too few mages to remove it efficiently, the debuff should be dispelled by priests, shamans, and protection warriors. In 25-man, more than 2 mages are needed: Spellsteal is very mana-intensive and triggers a global cooldown, so removing 5 stacks per mage will take a long time and nearly exhaust the mages's mana pools.
To do list:
* Spread out
* Interrupt Fel Fireball casts
* Spellsteal or dispel Nether Power
* Tank and nuke the adds quickly (ranged only)
* Healers: pay attention to Incinerate Flesh
* Move away if affected by Legion Flames
Passive healing or damage reduction should be used as much as possible to make healer's lives easier. Use healthstones, health potions, bandages, etc. to get rid of Incinerate Flesh, and don't forget Drain Life, Bloodthirst and Rune Tap.
