Green Firefly

The Green Firefly is a craftable Hardmode Pet summoning item. It spawns an Amnesiac pet to follow you around. The Amnesiac is immune to damage from enemies and despawns upon player death.

Trivia

 * The Green Firefly and the Amnesiac are references to the game . In it, the player controls a green firefly to guide an amnesiac child named Mion through a desolate ruins.