All Monsters (18)

• Amphisbaena
  OSE-AF
• Aquatic Monsters in Old-School Essentials Advanced Fantasy Genre Rules
  
• Aquatic Spider
  OSE-AF
• Behemoth Hippopotamus
  OSE-AF
• Bronze Dragon
  OSE-AF
• Eye of the Deep - Globular aquatic monster with a massive central eye, two eyestalks, lobster-like pincers, and a gaping maw
  OSE-AF, OSRIC
• Giant Electric Eel
  OSE-AF
• Giant Jellyfish
  OSE-AF
• Giant Lamprey
  OSE-AF
• Giant Poisonous Frog
  OSE-AF
• Giant Swordfish
  OSE-AF
• Locathath
  OSE-AF
• Merrow
  OSE-AF
• Normal Hippopota
  OSE-AF
• Sahyagin
  OSE-AF
• Sea Turtle
  OSE-AF
• Strangle Weed
  OSE-AF
• Water Fiend
  OSE-AF