Strategy

Lord Jaraxxus is a fight with relatively simple mechanics, but a lot of damage. Jaraxxus himself should be tanked in the center of the room, and dps should spread out as if for Kel'Thuzad. This is to avoid the chain lightning as much as possible, as this will hit for as much as 15,000 and arc to 3 people on 10-man regular. Jaraxxus will also periodically cast fireball on the tank, which will hit for 15,000, and tick for 6,000 every second for the next 5 seconds, so this should be dispelled as quickly as possible. This must be interrupted on 25-man, as it can easily one shot even Ulduar-25-stamina-geared tanks.

Jaraxxus will periodically spawn portals and volcanoes. Portals will spawn a Mistress of Pain, which must be tanked and burned down as fast as possible, as she will choose a random raid member, apply a Spinning Pain Spike debuff, pick them up and do 10 to 15k physical damage. Volcanoes will spawn 3-4 infernals, which should be tanked away from Jaraxxus. The infernals have an non-interruptable AoE which will hit everyone in about a 5 yard radius for 5,000, but they can be stunned. The infernals will also sometimes turn into a floating orb, hover over to a random raid member, and exploding dealing aoe damage in a small radius. Tanks need to pick the infernal up again quickly, or it will start killing raid-members.

Lord Jaraxxus will occasionally give himself 5 stacks (25-man: 10) of a magic buff that increases magical damage dealt by 20%, totaling 100% (25-man: 200%). Mages can (and should) spellsteal this buff as it will increase their DPS and make healing easier. If there are no mages in your group, priests can dispel the buff.

Jaraxxus also has a number of debuffs. The most important is Incinerate Flesh, which will be put on a random raid member (possibly an offtank) and which will absorb all healing on that target, till a certain amount of healing has been done (10-man: 30,000; 10-heroic: 40,000; 25-man: 60,000; 25-heroic: 85,000). This is not too much of a problem, as long as healers react quickly. If the debuff wears off without being healed through, the target will explode, dealing damage in a very large aoe, much like Vezax's flames.

The next debuff is Legion Flames, which will continuously spawn flames under it's target. There are two strategies for dealing with this, either the target can use damage reduction cooldowns and remain stationary, or they can run directly outwards. The idea with not moving is to not spawn as many flames all over the room. Not moving will cause each flame to hit you each second causing high amounts of damage over a short period of time.

This fight is also alot like Freya where all adds should be killed first for 10-man.

A fire resist aura should be used at all times during Jaraxxus, and any amount of passive healing or damage reduction that dps can provide will make the fight go much smoother.

Not sure where to post this, so here seems as good a place as any.

I had a quick look at the combat log after last nights ToC10-hero attempt.

From what i can see both the portals and the volcanoes have approx 10k health.

The typical 10 man raid setup has 5 dps.

I haven't played every class, but from what i remember they all have an instant attack that does around 2-3k dmg.

Would it be an idea for everyone to reserve their instants for the portals/volcanoes since 5x2k = 10k = dead mob.

Maybe a macro would help

#showtooltip
/stopcasting
/tar Infernal Volcano
/tar Nether Portal
/cast [INSTANT CAST]

need to replace [INSTANT CAST] with the appropriate spell.

On 25man version according to wowwiki they only have an additonal 1k health, and so the same approach could also work

http://www.wowwiki.com/Lord_Jaraxxus

Portals and volcanoes in ToGC 10 man have 190k health.

Nim