This magic horn is proof that at least one unicorn existed, and now is either dead or hornless.
Unicorn Horn is a gun that fires a continuous rainbow beam with strong knockback that homes in on enemies. A unique song is played whenever it is fired. Increases curse by 1 while carried.
Crystal Horn - If the player has Luxin Cannon, Luxin Cannon gets three crystal shots at the end of every magazine, and the crystal bursts into many more crystals. Additionally, when an enemy is killed with the Unicorn Horn, they explode into Luxin Cannon projectiles.
Double Rainbow - If the player has Stuffed Star, while Stuffed Star is active, five Unicorn Horn beams are fired from the player in all directions.
If the player has Helix Bullets the 2 rainbows fired will follow the same path, and not lose their homing property, unlike most other homing guns with Helix Bullets.