Defeat all three Mechanical Bosses
Go to the Hallow biome
Find and kill a Prismatic Lacewing at night
Use a Bug Net to catch the Prismatic Lacewing
Release or use the Prismatic Lacewing in the Hallow at night to summon the Empress of Light
Defeat all three Mechanical Bosses
Go to the Hallow biome
Find and kill a Prismatic Lacewing at night
Use a Bug Net to catch the Prismatic Lacewing
Release or use the Prismatic Lacewing in the Hallow at night to summon the Empress of Light