Now then ...
|Image from 7art|
The forlorn grey appears as a grey fog, usually about 20 feet long and 10 feet wide. To the touch, it is clammy and chilly, and an astute observer might notice that it does not leave a damp residue on people who walk through it.
A forlorn grey usually allows a group to get within it, and then moves along with them. It obscures vision, so most folks think that they are just moving through a very long patch of fog. Each round a person spends in the fog, their minds are attacked by the strange monster. The adventurer must pass a Will save, or lose a bit of their zest for living, not to mention suffer 1 level of energy damage. The TK should prepare several strips of paper outlining the apathy that has befallen a character who fails a saving throw. Some examples might be:
"You realize you don't really want to be in this stupid dungeon."
"Treasure isn't everything."
"That serving wench really wasn't all that attractive."
"It occurs to you that you don't really have any friends."
Once a creature within the forlorn grey reaches effectively 0-level, they take on a dull appearance, their eyes turning grey and losing their spark of life. They remain 0-level monsters at this point, normal humanoids of their type who are apt to wander aimlessly for the rest of their lives, begging for scraps and generally avoiding the company of others. They can again be restored to vigor through the use of a wish or restoration spell, and can otherwise be used as torchbearers by their former friends - they don't care one way or the other about it.
Fighting the mist is difficult. It can only be struck for full damage by magical edged weapons, and silver edged weapons deal half damage to the creature. Bludgeoning and piercing weapons deal no damage to a forlorn grey, magical or otherwise. If actively fought, the forlorn grey can manifest tendrils of super-chilled mist, with which it can make feeble physical attacks that, on a natural attack roll of '20', snake down people's throats (or through their noses), dealing double damage and forcing the victim to pass a Fortitude save or be stunned for 1d3 rounds. The creature can manifest three such tendrils.
Forlorn Grey, Large Elemental (Air), Average Intelligence: HD 7; AC 16 [+1]; Atk 3 tendrils (1d3 + see above); Move Fly 30; F11 R10 W12; AL Chaotic (NE); XP 1750; Special - Only damaged by edged weapons, silver weapons deal half damage, energy damage, stunning attack, immune to cold and acid.