Unicorns are mystical supernatural creatures in European mythology. They are allegedly a beast with a single large, pointed, spiraling horn projecting from its forehead, lion tail, goat feet, the body and head of a horse, the beard of a goat. However modern day depictions show unicorns as merely horses with horns.
The main villain of Legend wants to kill the remaining two unicorns in the world to bring about an eternity of darkness.
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The My Little Pony franchise primarily features unicorns.
1983: My Little Pony features three unicorns known as Moondancer, Majesty, and Glory. Generation 4 and 5 featured unicorns as main characters such as Rarity, Sweetie Belle, Appleittle, Izzy Moonbow, Misty Brightdawn, Starlight Glimmer and Sunset Shimmer. Twilight Sparkle was initially a unicorn but was turned into an Alicorn by the end of Season 3.
2012 (February 10): The Season 7, 14th episode of Supernatural, "Plucky Pennywhistle's Magical Menagerie" shows a unicorn chasing down a neglectful father and impaling him on its horn.
Unicorns (Once Upon a Time) show Snow White and Prince Charming two visions: while Charming sees an infant Emma will become a noble heroine, but Snow sees her daughter growing up to become a dark sorceress.
Unicorns are depicted as demonic entities in DC's Legends of Tomorrow. Sara and her team have time that kills its victims and kills.
The Dragon Prince features the fact that Claudia hunted from a unicorn and brought her father its very rare horn. Said horn was used in Viren's spell to enchant Sarai's spear with dark magic so that Harrow could slay Avizandum (see Unicorns).