Wyvern

A wyvern is a huge flying lizard with a poisonous stinger in its tail. While only a distant cousin of true dragons, wyverns' tendency to hunt in packs makes them dangerous foes. A wyvern’s body is fifteen feet long, and dark brown to gray; half that length is tail. Its wingspan is about twenty feet.

Abilities

 * Senses: Darkvision.
 * Languages: Draconic
 * Multiattack: The wyvern can make two attacks: one with its bite and one with its stinger. While flying, it can use its claws in place of one other attack.
 * Bite: Wyverns can bite at a target with it's giant teeth
 * Claw: Wyverns can make a claw attack.
 * Stinger: The wyvern can make an attack with its tail, which can poison a target.

Known Wyverns
Vox Machina encountered several wyverns being ridden by bandits in "Skyward". In a humorous turn of events, one of the flying beasts was polymorphed into a harmless rabbit, and consequently plummeted thousands of feet into the Ozmit Sea below.

Wyverns were a common element of Thordak's forces, usually used as mounts by the lizardfolk that served him.

Vasselheim has a group of wyvern riders among its military forces.