All Monsters (8)

• 16 HD Monsters in Basic Fantasy Role-Playing Game
  
• 16 HD Monsters in OSRIC
  
• Aerial Servant - Creatures from the Elemental Plane of Air, invisible on the Prime Material Plane
  OSRIC
• Albertosaurus - Much smaller cretaceous carnivore
  OSRIC
• Archaeopteryx - Jurassic carnivore; no bigger than an ordinary bird
  OSRIC
• Centrosaurus - Cretaceous herbivore that seems to have lived in very large herds
  OSRIC
• Giant, Mountain - Largest of all giants, living in clans that rule over mountain territories
  BFRPG
• Mosasaurus - Cretaceous carnivore that filled the same ecological niche as sharks
  OSRIC