D&D 5E Monsters
Monsters, Demons, Dragons and other beings
Reef Shark
Medium beast, unaligned
Remorhaz
Huge monstrosity, unaligned
Rhinoceros
Large beast, unaligned
Riding Horse
Large beast, unaligned
Roc
Gargantuan monstrosity, unaligned
Roper
Large monstrosity, neutral evil
Rug of Smothering
Large construct, unaligned
Rust Monster
Medium monstrosity, unaligned
Saber-Toothed Tiger
Large beast, unaligned
Sahuagin
Medium humanoid, lawful evil
Salamander
Large elemental, neutral evil
Satyr
Medium fey, chaotic neutral
Scorpion
Tiny beast, unaligned
Scout
Medium humanoid, any
Sea Hag
Medium fey, chaotic evil
Sea Horse
Tiny beast, unaligned
Shadow
Medium undead, chaotic evil
Shambling Mound
Large plant, unaligned
Shield Guardian
Large construct, unaligned
Shrieker
Medium plant, unaligned