Planar Vats
Hazard
Level 15 Blaster
XP 1200

Two great stone vats are filled with whirlpools of roiling eldritch energy.

Hazard: The planar essence within the outer vats is disturbed by the presence of living creatures.Perception     DC 18: A character who approaches either vat notices an increase in the agitation of the energy within it.Arcana or Nature or Religion     Arcana DC 18: The eldritch essence reacts to the presence of living creatures in the laboratory.     Nature DC 18: The green whirlpool in the western vat is the raw planar essence of the Feywild.     Religion DC 18: The black whirlpool in the eastern vat is
the raw necrotic essence of the Shadowfell.
Trigger       The trap activates and rolls initiative 5 rounds after the first living creature enters the area.
AttackStandard Action      Ranged sight
Target: Each vat targets two living creatures within the laboratory (determined randomly). A single creature can be targeted by both vats in the same round.Attack: +20 vs. ReflexHit: Tendrils of eldritch energy wrap around the target. On a hit, the Feywild vat deals 3d8 damage, and the target is dazed (save ends). On a hit, the Shadowfell vat deals 3d8 necrotic damage, and the target is slowed (save ends).
    A target that is hit by both the Feywild vat and the Shadowfell vat in the same round is subject to a secondary attack:
    Secondary Attack: +22 vs. Fortitude    Hit: 2d8 damage, and the target is stunned (save ends) instead of being dazed and slowed.Countermeasures     A character can make a DC 18 Acrobatics check to evade the attack of one vat per round as an immediate interrupt. On a successful check, the character takes half damage and is not dazed or not slowed.
     A character can make a DC 23 Arcana check to suppress the flow of planar energy in the laboratory as a standard action. With each successful check, the hazard takes a cumulative -2 penalty to attack rolls.
     The hazard deactivates 2 rounds after all living creatures leave the laboratory, but can be triggered again.

Published in Tomb of Horrors, page(s) 72.