Overlord Wyrmthalak

Chamber of Battle
Climb from the worg section to Overlord Wyrmthalak's chamber. Clear the approach and give the tank a position against the far wall before the pull. Keep the ramp visible for reinforcements, and leave the boss's front clear for Sweeping Slam. Wyrmthalak ends the Lower Spire route; Upper Spire starts back at the shared entrance.

Overlord Wyrmthalak
Elite DragonkinWyrmthalak ends Lower Spire with frontal Cleave and Sweeping Slam while reinforcements threaten the group's control of the ramp.
Abilities

Cleave
Keep melee players behind Wyrmthalak so Cleave cannot strike them beside the tank.

Sweeping Slam
Inflicts normal damage plus 50 to enemies in a cone in front of the caster, knocking them back.
Put the tank's back against the far wall and keep the rest of the group outside the frontal cone to limit Sweeping Slam's knockback.

Demoralizing Shout
Expect reduced melee attack power while the shout is active and keep damage focused rather than letting the fight spread toward the ramp.
Tank- Hold Wyrmthalak against the wall beyond his starting position so Sweeping Slam cannot throw you down the approach. Assign someone else to collect arriving reinforcements without turning his front through the group.
Healer- Heal from outside the Cleave and Sweeping Slam cone, with a view of the ramp so you can react when the reinforcement handler begins taking hits.
Damage- Attack from Wyrmthalak's rear and reserve crowd control for reinforcements reaching the ramp. Keep them off the healer while the tank maintains the wall-backed position.