This is a malevolent prankster spirit that gets its jollies by making people feel gross and cough. They love messing with people who think they are being sneaky by blowing a puff of irritating dust in their face. For the most part, they can't very well be truly defeated without some kind of exorcism; destroying its body just frees up the spirit to possess more filth and dust. Luckily for delvers, it is very fickle and annoyed easily, and usually gives up anyways and awaits or searches out a new target. A particularly pernicious individual might go from trap to trap as it is defeated, upping the ante each time.
Bite (14): Reach C, 1d-3 Crushing
Dust Spray (N/A): Shoots a 3 yard long, 3 yard wide cone of dust into the air in front of it. Roll HT to resist, or start coughing and sneezing lowering DX by 3, IQ by 1, and ruining stealth. +1 to resist if not facing the right direction, and +3 if wearing protective breathing gear. Characters that do not breathe are immune. Coughing and sneezing lasts for margin of failure minutes.
Explosive Puff (N/A): When it takes damage, it expels a dust cloud with a radius of 1 yard per 3 HP of received damage (Damage less than 3 HP has no effect.) If the attacker is in range, he or she rolls at HT-4 to resist. Other incidental casualties roll HT to resist. +1 to resist if not facing the right direction, and +3 if wearing protective breathing gear. Characters that do not breathe are immune. Coughing and sneezing lasts for margin of failure minutes.
Traits: Fur, Trickster (12), Sadist (12), Injury Tolerance: Homogeneous, Doesn't Eat, Doesn't Breath, Doesn't Sleep, Fragile (Brittle)
Skills: Brawling-14, Traps-12
Combat Effectiveness Rating:23 (OR 13 and PR 10)
Giving it knockback blowing powers might be an interesting twist. Pairing it with a sleeping powerful enemy could be a funny trap setup. An annoying prankster that likes to hide in small tunnels and breathe on the party at twists and turns in every tunnel could make a funny recurring attack.