Chaos Theory

Did this as a DK Frost Tank

1. Start tanking the boss at the very bottom of the ramps, so that your DPS don't accidently jump off the edge when kiting.

2. When the boss makes a rift, kite him and move back at least 20 yards

3. Every 25%, he will become invulnerable and turn into a rift himself (The "rift phase"). This lasts around 20-30 seconds, and all rifts previously made have infinite range. Have the entire party stand 15+ yards directly behind the tank. If done properly, all lightning attacks by the rifts will only hit the tank.

4. During the "rift phase", all DPS should burn down all the adds that pass by the tank.

5. When "rift phase" ends, kite the boss another 20 yards, and proceed to attack him. Keep kiting when he makes a rift, rinse and repeat steps 3 and 4 when he goes back into rift phase again.

6. He does "rift phase" at 75, 50, and 25% health.

7. Dampen magic from a mage makes this fight extremely simple. All lightning ticks from the rifts do only 200-300 damage instead of 500-600. Anti-magic shield and icebound fortitude also helped to mitigate the incoming damage to me in the "rift phase"

8. Good luck.

Actually, chaos theory is mathematical modeling that deals with systems which are extremely sensitive to initial conditions so that it appears to be random when there is actually nothing random involved. The weather would be an example of such a system. The most famous example is the butterfly effect. The idea that a butterfly flapping it's wings in Brazil can start a series of events that results in a tornado in Texas.

Not sure why no one has posted this yet...

Dampen Magic

This completely trivializes the fight. I healed it as a paladin without breaking a sweat. The AoE from the portals is completely absorbed and does almost no damage. This combined with fighting him progressively further from his starting point and you're golden.