This guide is from Icy Veins I've just changed a couple things that seemed to make more sense to me with experiences I've had with the encounters.

1. Immerseus

T1 - Soul Leech - provides absorption effect for minor healing
T2 - Mortal Coil - Nice little heal for when taking the raid wide damage (icy veins suggest you use shadow fury but our guild doesn't slack in the add killing department for this fight)
T3 - Soul Link - provides healthy mitigation + healing
T4 - Burning Rush - mobility (shouldn't have to use this with our guild)
T5 - Supremacy (Imp) or Sacrifice
T6 - Kil'Jaeden's Cunning

ALL
- adds die quickly. Immerseus is a glorified trash mob.
- Twilight Ward absorbs all forms of damage here.
Destruction
-cleave every chance possible with Chaos Bolt
-use Shadowburn like it's going out of fashion. Think Horridon's adds. Slimes speed up as they lose health, so Shadowburn is clutch for stopping them immediately.
-adds can be handled by a couple of Conflagrates. Chaos Bolt is overkill.

2. Fallen Protectors

T1 - Soul Leech - provides absorption effect for minor healing
T2 - Mortal Coil - extra healing
T3 - Soul Link - provides healthy mitigation + healing
T4 - Unbound Will - can dispel Shadow Word:Bane
T5 - Affliction & Destro - Supremacy; Demonology - Service
T6 - Affliction - Archimode's Darkness; Demonology - Mannoroth's Fury (As a Destruction Lock I keep Kil'Jaeden's Cunning)

ALL
- Multi-DoTing is the way to go. Demonology Doom or Affliction all DoTs will steamroll this fight.
- Twilight Ward absorbs a good chunk of Calamity. Twilight Ward should be used on CD.

[to be continued]