Spectral Tendrils
Trap
Level 13 Obstacle
XP 800

Ghostly tendrils whip from the ground to lash at you.

Trap: This trap consists of a continuous field of 10 squares. When a creature steps into the area of this attack, spectral tendrils lash out and attack the creature.Perception     DC 27: The character notices something strange about the area ahead, as though a ghostly mist hangs just above the ground.Arcana     DC 23: The character recognizes some terrain feature, usually a fresco or other art, that serves as the trap’s focus.     DC 31: The character’s knowledge provides a +2 bonus to Thievery checks to disable the trap.TriggerWhen a creature enters or begins its turn in a trapped square, the trap attacks.AttackOpportunity Action      Melee
Target: Creature in trapped squareAttack: +18 vs. ACHit: 2d10 + 6 necrotic damage and dazed until the end of the target’s next turn.    Aftereffect Dazed until the end of the target’s next turn.Countermeasures     Acrobatics DC 27: A character who makes a successful check can move through a trigger square without provoking the attack. The squares count as difficult terrain.
     Thievery DC 31: An adjacent character can disable a trigger plate with a successful check.

Published in Dungeon Master's Guide, page(s) 91.