Outside the boss:
-Don't get hit by hurty circles.
-Stack up on your linked friends. The middle one can't move, move to him!
-Get Touch of Doom debuff to the far outside edge of the room ASAP.
Adds outside the boss:
-Kite and kill the Constructs, don't let them reach you or you're dead.
-Kill the caster adds quick quick or bad things.
-Tank swap the big add, interrupt it, and DPS priority #1 on it.
**Melee on big add full time, ranged kill casters, dot and kite constructs, and focus big add in between.
Inside the belly...:
-Don't get hit by hurty circles.
-DPS down as much as you can. The more damage you do inside, the easier it is outside, whether the add dies or not
-Healers heal up the heal adds. Same principle as above, heal as much and as many as you can.
-When a tank is sent inside, pick up the big add that spawns and interrupt it. DPS get it to 50% before your time runs out.
-Don't get digested, or you're for real dead. Don't die again for 3 minutes, or you're for real dead, too.
0% Energy - Feast of Souls:
-Make sure all adds are dead.
-Stack up for heals.
-Nuke the boss, 100% damage taken debuff.
-Absorb the souls from the back of the room, DO NOT let them reach the boss. This is the primary mechanic of this phase.