The graveshell is a dangerous predator that draws scavengers and explorers into its grasp using a morbid lure: the corpse of a former victim impaled upon the spikes that protrude from its large, turtle-like shell. Aside from its shell, the monster resembles no known animal. Small but bright yellow eyes watch from the sagging flesh of its head, the most prominent feature of which is a curiously shaped, toothy maw twisted into a perpetual grin. Its stubby arms and legs are impractical for both walking and swimming, though the algae-caked claws tipping each limb are deadly weapons. Graveshells are intelligent—a fact that surprises many who encounter them—and surrender rather than fight to the death. These monsters have little to offer in exchange for their lives, though the waterlogged treasures on their collection of corpses may entice opportunists.
Creatures: The “muddy lump” in the middle of the pool to the north is in fact a dangerous ambush predator—a turtle-like beast called a graveshell. The lump is the graveshell’s back, and the body atop it is a lure to attract new prey. A second graveshell lurks nearby, although it has no decoy mounted on its back yet. The monsters lurch out of the water to attack anyone who tries to investigate the lure, or who simply tries to move through the pool into or out of the citadel.