4E - Hazard - Lurker 5 - Swamp Quicksand

From ENWiki

Swamp Quicksand Hazard Level 5 Lurker XP 200 Description: Swamp quicksand has no special description; it lurks beneath the surface of the swamp Perception, Nature or Dungeoneering check to detect: passive DC 35 / active DC 25 Attack: +11 vs. Reflex Countermeasure: DC 25 Athletics or Acrobatics check to escape. (Otherwise same as Deep Forest Quicksand)