Niter Patch (Elite)
Level 5 Elite Lurker
XP 400

When exposed to fire, the white encrustations covering the cavern’s walls explode in fiery death.

Hazard: Ten squares scattered across the room’s walls bear niter encrustations. When exposed to a fire or lightning attack, they explode into flame and create a zone of caustic salts to burn any creature that enters their area.Perception     DC 7: The character notices a glittering crust covering patches on the walls in its line of sight.Dungeoneering     DC 12: The character identifies the encrustation as being niter.TriggerWhen a niter patch is caught in the area of any close or area attack, the patch makes an opportunity attack. Each trapped square explodes only once. A triggered niter patch can trigger other niter patches in the blast's area. The hazard attacks when caught in the area of any close or area attack.Attack * Acid, Fire, ZoneOpportunity Action      Close blast 3
Targets: Each creature in the blastAttack: +9 vs. ReflexHit: 1d6 + 4 fire damage.Effect: The blast creates a zone of caustic salt that lasts until the end of the encounter. Any creature that enters the zone or starts its turn there takes 5 acid damage and grants combat advantage to all enemies (save ends). Creatures that are flying are immune to the zone’s effect.Countermeasures     A character can neutralize one square of niter with a radiant melee or ranged attack, and he or she can neutralize multiple zones by using a close or area radiant power that encompasses more than one of them.
     Athletics DC 30 or Athletics (with a running start) DC 15: A character can leap over the zone of caustic salt by making a successful check.

Published in Draconomicon: Metallic Dragons, page(s) 56.