This one is a ton of fun, but pretty challenging in co-ordination.
He has 3 colored portals that will spawn around him in the distance. Each sends a beam of colored light to him which buff him in one way or another. Players can stand in the way of the beam and get the buff instead while preventing the buff from hitting netherspite. While in the beams, the buffs will stack and eventually be more harmfull than buffing so people will have to rotate in and out of the beams. After you leave the beam and the buff fades, you will have a 2 minute debuff for which you cannot enter the same color beam...
He banishes himself every 45 seconds during which it's generally practiced to run back out of the room to avoid his attacks during it.
The beam you really want to care about is the red one. When you get in it you will gain 30,000 HP on top of what you already have. On top of this, whoever is in the red beam has 100% agro guarunteed. However, every second you stand in it your hp will be reduced by 1,000. So after 30 seconds, your hp will start to go down below what it was when you started. We use a healing pally or druid to jump in the beam behind us after the first 25-30 seconds to take over for the last 15 seconds until banish. It will take a few tries to get the transition, but it's quite easy once you establish the pattern.
When he banishes, you will have the 2 min debuff meaning you can't go back out into the red beam after the banish fades off, so you'll need another tank to do so, as well as another healing pally or druid to take over the last 15 seconds. During this part where I can't be red beamed, I usually go help heal for the first 10 seconds or so, then blow everything I have for damage. Avenging wrath, consecration, avenger's shield, exorcism & holy wrath ( hes an demon dragon ), sor, etc. After 30 seconds or so of this my mana will be very very low, so i use a trick with the green beam. If you jump in it, let is stack once, then jump out, you will gain 100% mana back after the beam wears off. This is perfect because almost as soon as I'm out of the green beam, he will go into the banish phase and it will be my turn to tank again after he comes out of banish. Then the whole pattern repeats itself; red beam tank, healing pally/druid replaces you, banish, heal, dps, green beam, 100% mana, banish, repeat.
The beams can and will change positions after each banish. It is very important that when its your turn, you get to the red beam as soon as possible. A helpful trick I found was to use exorcism when back into the room, look quickly for the red portal and run straight at it. This ensures that I am perfectly positioned between the portal and the dragon, since he's directly behind me from my exorcism threat. Many times before I figured this out, i was trying to position myself halfway in between the dragon and the portal, and when the beam comes I was actually a few yards off, and the red beam hits someone else. This is the worst thing that can happen if it's a mage or a healer, they can get one shotted and you NEED everyone alive. Running straight at the portal with the dragon behind you makes sure the beam will hit you and only you.
I go for the dps while I'm not tanking because he NEEDS to be damaged 20% between banishes in order to kill him within 9 minutes. If the fight goes longer than 9 mins, he will enrage and destroy everyone. While my dps is certainly not huge, every little bit helps. Depending on your raid makeup, you may have to heal instead, it really depends on which is needed more.
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Aergis -70 Paladin, Frostmane
