Unicorn

Unicorns were a species of supernatural horses with horne. Originally, these creatures don't exist into the Buffyverse. However, they become totally real under Clem's writting on Slayer Handbook for to prevent his friend Harmony Kendall (herself a fan of these creatures) to create sinisters rules where she was the mistresss of the Earth. After a brief clash with Clem, she apologizes him, happily to see a real unicorn.

Appearances

 * Day Off (or Harmony In My Head)