SOUL FRACTURE on tank - tank swap. Kill green adds, interrupt them. tank runs over remains.
OBLIVIONS ECHO (green arrow on head, large hollow circle) - Drops a silencing puddle. Drop on green adds to silence them.
FROSTBOUND DEVOTED adds - kite, stun, kill.
DARK EVOCATION - boss rezzes adds - kill them again. Will also rezz dead players and mind control them. DON'T BE DEAD!
GLACIAL WRATH (blue arrow on head) . frosty spikes that decay over time but cause damage when they die. Dps one at a time so damage is spread.
FROST BLAST (big white swirly) - half raid stack to spread damage (sticks to the spot, so not everyone). Disengage, shape shift, etc, breaks.
HOWLING BLIZZARD - expanding ice patches - avoid, find safe spot.
Two areas - the boss room and the Phylactery
Boss Room - adds phase
UNSTOPPABLE ABOMINATIONS - tanks face them away from raid
SOUL REAVER - interrupt Banshees cry as much as poss. Increasing damage.
Boss casts VENGEFUL DESTRUCTION - stop by entering Phylactery (move to boss, press button). either Everyone kills adds, then most go to Phylactery, or several DPS and a healer go down, and let the rest deal with the adds.
Phylactery - ghosty boss
Avoid swirlies, beams, tornadoes. Stacking damage, so can't stay for long.
Leave when he becomes immune (every 33% health), before he finishes his cast of UNDYING WRATH.
Phase ends when the ghost boss finishes cast - any adds remaining upstairs will be empowered - kill asap.
Phase 1 starts again, but boss casts more often. Repeat until Phylactery boss dies, then Phase 3 starts.
Many of the bosses previous casts no longer happen, however some do.
More adds, some of those from Phase 2, kill asap.
The frost on the ground now stays, doesn't explode, and grows slowly, covering platform - soft enrage.
Add/dead people rezz still happens .. DON'T BE DEAD!!
Bloodlust and nuke until you can dance on his cold dead body.