Unicorns

Unicorn, according to the lore, is a legendary animal that has been described since antiquity as a beast with a large, pointed, spiraling horn projecting from its forehead.

Season 2

 * Dean: (on angels) Because there's no such thing, Sam.
 * Sam: Dean, there's ten times as much lore about angels as there is about anything else we've ever hunted.
 * Dean: Yeah, you know what? There's a ton of lore on unicorns too. In fact, I hear that they, they ride on silver moonbeams, and they shoot rainbows out of their ass.
 * Sam: Wait, there's no such thing as unicorns?
 * Houses of the Holy



Season 7
An employee of the chain, Howard, is using magic to kill children's parents, with a manifestation of their children's fear. One of the victims of circumstances is a man who is killed when he is impaled by the horn of a unicorn.

Trivia

 * Unicorns have not yet been presented in the series as a true creature. The unicorn who appears in Plucky Pennywhistle's Magical Menagerie was a manifestation of a child's fear, not a creature.
 * Dean does not believe in their existence.