Wikia

The Igneous Depths^{[58, 49]} is a large cavern whose opening is located along the edge of the Magma Springs. There are no regular mobs to speak of, only items that are important to several daily quests. Dousing the blue, glowing runes, for instance, will summon elementals each time. There is a rare spawn in here that hunters can tame, so be on the watch for it.

This is also the setting for the final confrontation between Leyara and Hamuul Runetotem during Into the Depths.