Altitude -64
The Caverns — the old mineshafts and natural caves that wind beneath the surface — are a broken, lightless underworld of dug tunnels and collapsed galleries, quite separate from the engineered Sanctums. They are claimed wholly by the undead, and a traveller who descends without good reason rarely climbs back out. Yet for all their danger the deep dark hides real prizes — among them the device that renders the Architects’ tablets legible — for those willing to go down and take them.
The tunnels are thick with shambling Blocker dead and, more numerous still, the bone-built Revenants who guard the dark with grim purpose. Over them all reigns the Bone Queen, a crowned and caped Revenant who suffers no intruder to leave her domain alive. (For the Blockers, the Revenants, and the Bone Queen, see Revenant.)