Rainbows and Unicorns

Two Hallow treasures in one pose: the Rainbow Gun lives in the dungeon's Hallowed Chest (needs the 1-in-2500 Hallowed Key, post-Plantera - see Big Booty), and the Unicorn Mount's Blessed Apple drops from Hallow unicorns (1-in-200ish). Saddle up, fire the rainbow, pop. Pure style points, and fair play to whoever at Re-Logic dreamed the image up.