Caustic Geyser
Hazard
Level 9 Blaster
XP 400

A geyser of acidic liquid explodes from the ground.

Hazard: The geyser becomes active when triggered. Thereafter, it attacks every round on its initiative.Perception     DC 28: The character detects the geyser before moving within 6 squares of it.Nature     DC 24: The character recognizes the danger of the geyser before moving within 6 squares of it.Diplomacy     DC 24: The character recognizes the danger of the geyser before moving within 6 squares of it.Initiative +3TriggerThe geyser rolls initiative when one or more characters move within 6 squares of it.AttackStandard Action      Close burst 3
Targets Creatures in burstAttack: +12 vs. ReflexHit: 3d8 + 4 acid damage and followup.    Followup +10 vs. Fortitude    Hit: Ongoing 5 acid damage and blinded (save ends).Miss: Half damage.Countermeasures     Acrobatics DC 28: A character in the burst can minimize the damage of the geyser with a successful check made as an immediate interrupt before the geyser’s attack. With a successful check, the character takes half damage if the geyser hits and no damage if it misses.

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