Runed Cavern
Runed Cavern is a node in the Azurite Mine, that contains a Harbinger battle.
Encounter
The encounter is divided into several add phases, as the Harbinger himself is invulnerable in the meantime. After clearing several waves of various adds, Harbinger becomes vulnerable to attacks and can be killed.
After finishing the encounter successfully, Harbinger drops the usual currency shards as a loot.