Gizrul the Slavener

Bloodaxe Storehouse and Halycon's Lair
Take the uphill storehouse branch for Quartermaster Zigris, then return to the junction for Halycon's lair. Clear the storehouse patrols before Zigris can immobilize the group. Recover before pulling Halycon and keep healing resources for Gizrul the Slavener, who arrives after Halycon dies.

Gizrul the Slavener
Elite BeastGizrul arrives after Halycon and combines a healing bite with a disease that makes his victim take more Physical damage.
Abilities

Fatal Bite
Fatal Bite restores Gizrul's health while hurting his victim, so keep damage concentrated on him and recover the tank immediately after the bite.

Infected Bite
Inflicts Nature damage to an enemy every 10 sec. and increases the Physical damage it takes for 3 minutes.
Remove Infected Bite as a disease. Its increased Physical damage taken makes leaving it on the tank dangerous even when its periodic damage looks manageable.

Enrage
Keep tank mitigation and remaining damage cooldowns for Enrage, especially if Infected Bite is still on the tank.
Tank- Collect Gizrul as he reaches the lair after Halycon's death. Use a defensive while Infected Bite remains and keep another response for Enrage.
Healer- Remove the Infected Bite disease from the tank and replenish health after Fatal Bite. Carry any remaining Halycon bleed into that healing plan.
Damage- Wait for Gizrul's pickup, then commit the cooldowns saved from Halycon to overcome Fatal Bite's healing. Help remove the disease if your abilities permit it.