Prismatic Lacewing

The Prismatic Lacewing is a rare flying Critter that resembles a butterfly and spawns in the Surface Hallow from dusk until midnight 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. Only one Lacewing can be naturally spawned at a time. Because it can only spawn between dusk and midnight, its spawn is limited to between the times of 7:30PM and 12:00AM.

Building a platform roughly 35 tiles above a hallowed forest, and being under the influence of a Water Candle. You can expect 3-8 Lacewings to spawn, provided you are there from 7:30 to 12:00.

It is one of the few enemies that can be detected by the Lifeform Analyzer.

Contrary to popular rumours, wind does not seem to affect rarity or spawn rates.

Tips

 * Keep the Guide to Critter Companionship with you so you may farm the Hallow without having to worry about you or a minion/summon accidentally killing it.
 * A Lifeform Analyzer can be used to see if one is nearby.
 * The spawn rate is increased in Hallow biomes in the outer 2/3 of the world.
 * Using a Battle Potion and Water Candle increases its spawn rate, like other monsters.
 * Similarly, the spawn rate is increased during the Blood Moon event.