At least some content in this article is derived from information featured in Harry Potter: Hogwarts Mystery. Spoilers will be present within the article.
Sir Cadogan, one of the Knights of the Round Table, bravely engaged the creature in combat. The Wyvern, however, was too strong for Cadogan, and it managed to eat Cadogan's horse, break his wand, and melt his sword and visor with fire before Cadogan could escape.
Cadogan and the Wyvern then had a second, shorter encounter after Cadogan managed to procure another mount, an overweight pony that was grazing in a nearby meadow. The Wyvern bent its head to try to gobble up the knight and his new steed, but Cadogan's damaged, misfiring wand stabbed the Wyvern's tongue and ignited the fumes from its stomach, causing the beast to explode.
"Wyvern" is a heraldic term for a winged two-legged dragon with a barbed tail.
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Pottermore (Mentioned only)
- Harry Potter: Hogwarts Mystery (Mentioned only)