All Monsters (21)

• Black Pudding - Amorphous creature that lives only to eat, scouring underground areas for organic matter
  BFRPG, OSE
• Brown Mold - A fungus that feeds on light and warmth, causing cold damage to nearby creatures
  Field Guide
• Brown Mould - A heat-absorbing fungus that feeds on energy and grows in darkness
  OSRIC
• Curse - A reddish-brown mass of viscous liquid about 10 feet across
  Field Guide
• Gelatinous Cube - Nearly transparent cube that travels dungeon corridors absorbing carrion, creatures, and trash
  BFRPG, OSE, OSRIC
• Gold Slime - An oozing blob of gelatinous golden slime about 3 feet in diameter which lives by devouring gold
  Field Guide
• Green Slime - Dripping, green slime that clings to walls and ceilings
  OSE, OSRIC
• Grey Ooze - Slimy horrors that lurk on stone surfaces or among boulders
  OSE, OSRIC
• Jelly, Black - Amorphous creatures that live only to eat, inhabiting underground areas
  BFRPG
• Jelly, Glass - Huge transparent jelly that absorbs carrion and creatures, trapping inorganic material visibly inside its body
  BFRPG
• Jelly, Gray - Amorphous creatures that live only to eat, scouring underground areas
  BFRPG
• Jelly, Green - Bright green, wet, and sticky jelly that devours flesh and organic materials on contact
  BFRPG
• Jelly, Ochre - Yellowish-brown amorphous monster up to 10 feet in diameter
  BFRPG
• Ochre Jelly - Giant, ochre amoeboids
  OSE
• Ooze Monsters in Basic Fantasy Field Guide Omnibus
  
• Ooze Monsters in Basic Fantasy Role-Playing Game
  
• Ooze Monsters in Old-School Essentials Classic Fantasy
  
• Ooze Monsters in OSRIC
  
• Red Slime - An oozing mass that appears to be a red pool, notorious for hiding and surprising victims
  Field Guide
• Slithering Tracker - A transparent slime monster, similar in nature to the gelatinous cube but smaller and more amorphous
  Field Guide, OSRIC
• Stunjelly - Translucent creature that appears as a normal section of wall until prey approaches
  OSRIC