Jergosh the Invoker

Searing Blade camp
Continue beyond Taragaman into the Searing Blade camp. Clear the lower camp for Jergosh, then take the raised path to Bazzalan. Loot the Cultists and Warlocks for both books before leaving; Hidden Enemies requires both Jergosh and Bazzalan.

Jergosh the Invoker
Elite HumanoidJergosh tests interrupts on Immolate and curse removal for physical attackers weakened by Curse of Weakness.
Abilities

Immolate
Burns an enemy, then inflicts additional Fire damage every 3 sec. for 21 seconds.
Interrupt Immolate to prevent its initial hit and continuing burn. If it lands, remove the harmful magic when possible or heal through the remaining damage.

Curse of Weakness
Remove Curse of Weakness from physical attackers when possible; its damage penalty applies to Physical damage.
Tank- Bring Jergosh to cleared ground at the camp's edge and keep him in reach of the players interrupting Immolate.
Healer- Remove Immolate if your class can dispel harmful magic; otherwise cover its continuing burn. Curse of Weakness requires curse removal rather than a magic dispel.
Damage- Reserve an interrupt for Immolate. Physical attackers should call for Curse of Weakness removal instead of continuing the fight with reduced damage.