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Unicorn Horn

This magic horn is proof that at least one unicorn existed, and now is either dead or hornless.

• Name: Unicorn Horn
  
• Type: Passive, Familiar
  
• Item Pool: Curse Room, Red Chest
  
• Description: A familiar that follows in front of the player and fires a rainbow beam after shooting continuously for a few seconds.

Details: This item is a copy of Unicorn Horn from Enter the Gungeon; it has the same sprite and music as the original one. Its damage per tick scales with the player's damage and has a 0.65 multiplier. The familiar preparing to shoot is indicated by a glow animation that gradually speeds up. If mouse controls are enabled, the beam can be aimed using the cursor.

Credit to the Marshmallow mod, where I looked for examples of how to use callbacks for familiars.