Calamity's Vanities/Cosmic Bubble

The Cosmic Bubble is an Expert-exclusive pet summoning item sold by the Oracle after The Devourer of Gods has been defeated. It summons a Cosmic Assistant to hover above the player's head. The assistant will stay spinning inside of a ring, and will mimic the player's movements inside of the ring.

Trivia

 * As the tooltip mentions, the item is dedicated to Enreden, a spriter for the mod.