EQ Mob:Maestro of Rancor Plane of Hate: Revisited  

Maestro is INVULNERABLE until 100 mobs in Plane of Hate: Revisited have been defeated. It is recommended you clear both floors of the Maestro building before engaging.

On Maestro death a chest spawns. The Maestro's Trove

Quest Group/Raid Expedition: Plane of Hate: Revisited