Odd Mushroom

The Odd Mushroom is a Hardmode consumable item that can be purchased from the Drunk Princess for. Consuming it grants the Trippy buff for one hour, which gives every enemy and projectile on-screen a hallucination effect similar that of Expert Mode Brain of Cthulhu, as well as giving enemies and projectiles a rainbow hue that constantly cycles. It also places a wavy Heat Distortion effect across the entire screen. Lastly, the Trippy buff grants the player a whopping 50% increase to all damage.

Trivia

 * The effects of the Odd Mushroom are a reference to psychedelic mushrooms, which have the notion of warping the perception and sense of the users.