Necrotic Rain
Level 17 Elite Obstacle
XP 3200

A hissing curtain of necrotic rain flows down the walls of the chasm.

Hazard: Deadly tendrils lash out from within the necrotic rain.Perception     DC 13: The necrotic rain twists in unnatural patterns as it falls.Arcana     DC 20: Within the black rain, the character detects tendrils that are sensitive to the presence of living creatures.Trigger       When a living creature descends more than 10 feet into the chasm (most likely by flying or by climbing down a rope), the hazard attacks at the start of each of the creature’s turns.
AttackStandard Action      Melee
Target: The creature that triggered the hazard.Attack: +20 vs. ReflexHit: 2d8 +6 necrotic damage. Shadowy tendrils pull the target 1 square toward the wall of the chasm. A character pulled against the wall is drawn into the fall of necrotic rain.Countermeasures     A flying character can make a DC 20 Acrobatics check or Athletics check as an immediate interrupt to partially evade the tendrils’ attack. On a successful check, the character takes half damage and is not pulled toward the wall.
     A character descending on a rope cannot evade the attack. A character at the top of the rope can make a DC 23 Athletics check as a standard action to evade the pull. Up to two other characters can aid the character making this check.

Published in Tomb of Horrors, page(s) 69.