Green Fog

A swirling green mist spreads across the ground, moving despite the lack of a breeze. As strange as the mists are, their sinister nature is not revealed until a creature vanishes into the fog. The mist transforms and corrupts the unwary soul, twisting it into a horrid mockery of what it once was. Unless the creature can somehow shake the green fog’s effects quickly, the transformation will become permanent.

    Effect: A patch of green fog covers an area 4 squares on a side. Squares in the fog are lightly obscured. Each round on initiative count 10, roll a d4. The green fog moves a number of squares equal to the die result in a random direction. Should the green fog move entirely out of the encounter area, remove the fog from play.
    Any living creature that starts its turn in the green fog must make a saving throw. On a save, there is no effect. On a failed saving throw, the creature becomes a green fog mutant (save ends). Until the effect ends, the creature takes a -2 penalty to attack rolls, speed, and skill checks, but gains a +2 bonus per tier to damage rolls.
    If a creature ends the encounter still subjected to the green fog’s effects, the effects are permanent until the creature is the recipient of a Remove Affliction ritual or similar magic.
    Usage: Green fog is not natural to the world; it originated in the Far Realm. For this reason, the queer mist only appears in tortured landscapes and warped terrain where the Far Realm’s influence has been felt.

Published in The Book of Vile Darkness, page(s) 2-28.