When you enter the zone there will be three werewolves directly ahead of you. Have two people click the bone piles on either side of the front room simultaneously to make some of the wolves go away and then pull what is left. If you don't do this you end up with 4 or 5 wolves at one time.
Zylphax the Shredder Pull to the corner as he has a frontal power drain. When he says "Oops I dropped something" you have about 4 seconds to be as far away as you can to avoid a nasty poison AOE called Stench of Death. This AOE hits very fast.
Go to the south hallway, be prepared for trash to come in groups of 4 or 5 at one time. When you get to the last room stay far left when you enter to avoid aggro.
Othysis Muravian Every 30 seconds or so she will summon a heroic add who will heal her. She will also cast Prone to Corruption on a member of the raid, if they don't die from the spell it will spawn an epic x2 add. Have OT pick these up and kill them.
Go to north hallway, same type of trash as south. Last named will not start dialogue or become aggro until everyone is in his room.
Treyloth D'Kulvith If you pile into the close corner to the right as you enter he will not aggro until pulled. He will memwipe at 75%, 50%, and 25%. He casts Reaching Rot every 34 seconds or so which is an AOE that hits anything outside of 10m. He continuously casts Searing Rot which is an AOE that hits anything within 5m. Try to stay between those two to take minimum damage. He also puts an arcane detrimental on the raid which must be cured or your spells reflect.