How to get there: Beneath the peninsula south of Greenholm, at (-3100, 6500).
Silkmaw, the Brood Matriarch (level 180) inhabits this cave. One boss occupies the northern arena; the screened southern approach lies outside it. After defeat, the boss returns at the next :00, :10, :20, :30, :40 or :50.
Look for the entrance lantern and warning sign. Read the warning before descending; the southern lamps lead back to the surface ladder. The landing has stone cover but is not a protection zone. Bring food and a light, and finish or escape combat before using the ladder.