All Monsters (13)

• 14 HD Monsters in Basic Fantasy Field Guide Omnibus
  
• 14 HD Monsters in Basic Fantasy Role-Playing Game
  
• 14 HD Monsters in Old-School Essentials Advanced Fantasy Genre Rules
  
• 14 HD Monsters in OSRIC
  
• Baluchitherium - Giant prehistoric animal, the largest land mammal to ever exist
  Field Guide, OSE
• Black Knight - A cursed heroic warrior transformed into an undead skeleton with burning coal eyes, retaining its honor and combat prowess
  Field Guide
• Celestial, Watcher - Enigmatic celestials tasked with observing the mortal realms to ensure balance and harmony are maintained
  Field Guide
• Golem, Stone* - A 9-foot tall humanoid construct made from stone, weighing around 2,000 pounds
  BFRPG
• Indricotherium - A prehistoric ruminant that looks like a large rhinoceros
  OSRIC
• Mohrg - The animated corpse of a mass murderer or other heinous villain
  Field Guide
• Sea Serpent - Serpentine monsters which live in the sea, ranging from 20' to 40' long
  BFRPG, OSE, OSE-AF, OSRIC
• Stone Golem - Construct made of stone that can cast slow spells
  OSE-AF, OSRIC
• Tarbosaurus - Cretaceous carnivore, closely related to tyrannosaurus
  OSRIC