In the dome, Cang was first to spot the unusual indentations in the floor. The rippled concrete ended in a suspicious line, and the floor beyond was speckled with dust. He threw a look to Shyan, who signalled a halt. Cang inspected the edge, and tossed a handful of stones onto the dust. Nothing happened. Scowling, he unbuckled his warhammer, and with a cry, smashed it before him. Instantly, the floor gave way, crumbling easily beneath the weight of the hammer. Below, a half-dozen sharpened spikes stood straight up. Impaled upon one, at the filthy bottom, was the dry-rotted ribcage of a humanoid.