I've already posted these guys for Dungeon World. Now I've made the Sludge Dwarves all ready for Labyrinth Lord or other OSR games.
Don't forget to check out their factory!
Movement: 60' (20')
Armor Class: 4
Hit Dice: 2**
Damage: 2d4 + disease (sludge thrower) or 1d6 (shortsword)
Hoard Class: XVIII
The Sludge Dwarves plumb the poisonous depths of the Deep Down Bellow, mining, collecting, and refining the most noxious and dangerous of alchemical substances under the earth. They sell these chemicals to the various factions of the Deep Down Bellow as well as evil wizards and alchemists on the surface world.
Sludge Dwarves are thinner and more wiry than other dwarves, with greasy green-black beards and hair. Their gray skin is mottled with scaly patches and unhealthy purple lumps. Gritty brown slime perpetually coats their clothing and gear.
The sludge thrower is disgusting hand-held weapon connected by a hose to a tank full of caustic alchemical ooze worn on the user's back. This tank holds enough ooze for 20 attacks. The sludge thrower has a range of 50/100/150. A character hit by a blast from the sludge thrower takes 2d4 damage and must make a save vs poison. Failure indicates that the character has contracted a debilitating disease that will reduce the victim's maximum hit points by half and reduce their Strength and Constitution score by 4. A sufferer can make another save vs. poison each week to overcome the disease. A cure disease spell will instantly remove the infection.
Sludge Dwarves do not have the resistance to magic that other dwarves possess. However, they have developed a total immunity to all poisons and diseases. Sludge Dwarves have advanced infravision that extends 120'
Any group of 20 Sludge Dwarves will be accompanied by a boss whose level is determined by rolling 1d6+2. In the presence of a boss, Sludge Dwarves have a morale of 10.