Silt Sink
Level 8 Obstacle
XP 350

A cloak of swirling silt covers the ground. Its featureless surface veils suffocating depths.

Hazard: A 4-by-4-square section of silt-covered ground conceals a 30-foot-deep pit.Perception     DC 19: The character detects a subtle difference in the silt flow over the area of the pit.Nature (only if the character succeeds on the Perception check)     DC 15: The character realizes that the silt sink is deep enough to bury a creature.TriggerWhen a creature enters one of the hazard’s squares, the hazard makes the following attack.AttackOpportunity Action      Melee
Target: The triggering creatureAttack: +11 vs. ReflexHit: 3d10 damage, and the target is immobilized and takes ongoing 5 damage (until escape; see “Countermeasures”). The target falls to the bottom of the silt-filled pit.Miss: The target returns to the last space it occupied, and its move action ends.Countermeasures     Acrobatics DC 19 or Athletics DC 19: A trapped character can make a DC 19 escape check as a move action to end the immobilized condition and rise 10 feet up the silt pit. The character is immobilized again if still in the pit at the end of his or her turn.
     A nontrapped character who can reach someone in the pit (perhaps with a pole, a branch, or a similar tool) can spend a move action to pull a trapped creature 10 feet up the silt pit.

Published in Dark Sun Creature Catalog, page(s) 140.