Phaseweb
Trap
Level 12 Obstacle
XP 700

This spiderweb is almost transparent and seems to fade in and out of existence.

Trap: This trap consists of three phasewebs. A single phaseweb fills 4 contiguous squares, which are difficult terrain for non-spider creatures.Perception     DC 25: The character notices the phaseweb.Arcana     DC 16: The character identifies the web as the creation of a phaseweb spider, and recalls its properties.TriggerWhen a creature enters or begins its turn in a phaseweb’s space, the trap attacks that creature.AttackOpportunity Action      Melee 1
Target: The triggering creatureAttack: +17 vs. ReflexHit: The target is restrained (save ends). If the target is moved so that it is no longer within the space of a phaseweb, the restrained condition ends. First Failed Save: The target is also weakened as long as it is restrained. Choose another square containing a phaseweb within 20 squares of the target. The target is teleported to that square and takes 3d8 +5 psychic damage, and is no longer restrained.Countermeasures     Acrobatics DC 20 or Arcana DC 20 or Athletics DC 20: A character restrained by a phaseweb can make a successful check as a standard action to make a saving throw against the restrained condition.
     A character can attack the web (AC 4, other defenses 12; hp 60; insubstantial, vulnerable 10 fire). Dealing 60 damage destroys the entire 4-square area.

Published in Dragon Magazine 370, page(s) 49.