Unicorn

The  is one of the mythical creatures unleashed in the Red Dead Redemption Undead Nightmare DLC pack.

Description
It seems to be a whiter version of the Hungarian Half-bred horse with the addition of a horn and cloven hooves. It also has a permanent halo of butterflies and leaves a rainbow trail in its wake as it gallops.

The  also has unlimited stamina, and is extremely tough. It can take an almost endless amounts of shots to the side, however, it still drops dead when shot in the head or falls from a high cliff. The unicorn is the fastest mount in undead nightmare.

Location
The  can be located in the fields northwest of Torquemada after the player has killed the Chupacabra.

Unlike other challenges, you don't get the "a mythical creature has appeared in the area" message. Players may see it in the distance but not investigate further because they're expecting a blue circle on the map.

The  also does not have a Blood Pact for quick summoning. If the  dies, it can be re-acquired in this same location, however the player must break the animal once again.

thumb|300px|left|Fan Service Achievement / Trophy Guide - Where to find the Unicorn

Trivia

 * The Unicorn can be differentiated from other undead mounts by the pure white skin, and the rainbow trail that follows behind it. When at a standstill, butterflies emerge from underneath, similar to Famine's swarm of locusts.
 * If you look closely, you will notice that the Unicorn has cloven hooves like that of a reindeer.
 * When killed, the unicorn will appear to have bugged physics and fly randomly about until it disappears. After a while you can whistle to get it back.
 * The only way to find the Unicorn is to complete both the Undead Hunter Challenges & Four Horses of the Apocalypse.
 * Finding and breaking the Unicorn is one of the requirements of the Undead Hunter/Army of the Undead Outfit.

Achievements/Trophies
Finding and breaking a  will contribute to the acquisition of the following Trophies/Achievements: