Empress of Light

The Empress of Light is a Hallow boss. It is summoned by killing a Prismatic Lacewing at night in the Hallow. The Prismatic Lacewing will only spawn after Plantera has been defeated.

Behavior

 * The boss uses fast-paced multicolor attacks similar to the Prismatic Crystal weapon. She has two attack patterns: In the first, she will alternate between various attacks in which multiple projectiles home in on the player. In the second stage, she will fire projectiles across the screen in straight lines at various angles.
 * If she is fought during the day, all of her attacks will deal massive amounts of damage, killing the player instantly. If the Empress is killed during the day, she will drop the Terraprisma.

Tips

 * It would be wise to defeat Golem first, so the Cosmic Car Key will become available.
 * It may be helpful to reduce the boss to very low health just before dawn, then intentionally delay killing her until sunrise begins to obtain the Terraprisma. Players may find a watch or its upgrades useful to track the start of day.

Trivia

 * This boss was described as "a beautiful bullet hell" by Cenx before 1.4 was released.
 * If you are to take on this boss the moment it becomes available to you, it can be considered the hardest boss in the game, beating both the Moon Lord and Duke Fishron in difficulty.
 * She is similar to Skeletron Prime in that she gains increased damage during the day. However, Skeletron Prime does not drop items when defeated at daytime, unlike the Empress of Light.
 * The Empress of Light is one of the two new bosses added prior to the 1.4.0.1 update also know as the “Journey’s end” update.