Prismatic Lacewing

The Prismatic Lacewing is a rare flying Critter that resembles a butterfly and spawns in the Surface Hallow at night after Plantera has been defeated. Killing it summons the Empress of Light boss.

The Prismatic Lacewing can be caught with a Bug Net, and be used to craft a Prismatic Lacewing Jar. Releasing it from the inventory and then killing it will still summon the Empress of Light. Care must be taken not to release this outside of the hallow or it will immediately despawn.

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Tips

 * Collect any Prismatic Lacewings you happen to find via the Bug Net, so that you can farm the Empress of Light when ready. Disable any minions to prevent them from killing it.