Guide:Obtaining a Terraprisma

The  is an powerful summon weapon that is dropped from the Empress of Light only when all damage dealt to the Empress occurs during the day. The Empress enrages during the daytime, causing all of her attacks to instantly kill the player, which vastly increases the difficulty of the boss fight.

Spawning
In order to spawn the Empress of Light, you need to kill a. They spawn in the Hallow after Plantera has been killed and only spawn between dusk and midnight (7:30 PM and 12:00 AM). An easy way to ensure that all damage is dealt during the day is to use a to catch a Prismatic Lacewing during the night and then release and kill it during the day.

Differences between Night and Day
The Empress of Light will enrage if still alive or if summoned during the daytime, causing her attacks to do tens of thousands of damage, similar to the Dungeon Guardian, instantly killing players who are hit by her attacks. This enraged state is indicated by her attacks turning from rainbow to bright yellow.

Attacks
Prismatic Bolts – Summons a cloud of prismatic bolts that home in on the player after a short time. These bolts do not have perfect tracking, and will miss if the player makes a sharp turn as they approach. Because she is enraged, extra bolts are created, and they will spread out more before homing onto the player.
 * Dash Attack – Positions herself to the left or right of the player before charging horizontally in the player’s direction.
 * Sun Dance – Hovers above and slightly to the left of the player and emits 8 rays of light that slowly rotate clockwise. 3 sets of rays are created per sun dance, each positioned slightly more clockwise from the last.
 * Everlasting Rainbow – Releases a ring of 13 stars that spiral out clockwise, then spiral back in the same direction. These stars leave behind a trail of light that will damage the player.
 * Ethereal Lance – Summons a swarm of swords that launch in the direction the player was headed when they were summoned, telegraphed by colored beams. These swords are summoned behind where the player was moving, or all around the player if they were stationary. The swords do no damage until launched. Because she is enraged, extra swords are summoned, and they will launch faster.

Attack Pattern
The Empress has set attack patterns for both of her phases.

First phase
When spawned, the Empress will hover in place for a few seconds before executing the following attacks in order:


 * 1) Prismatic Bolts
 * 2) Dash Attack
 * 3) Sun Dance
 * 4) Dash Attack
 * 5) Everlasting Rainbow
 * 6) Prismatic Bolts
 * 7) Dash Attack
 * 8) Ethereal Lance
 * 9) Dash Attack
 * 10) Everlasting Rainbow

This sequence of attacks will repeat indefinitely until the second phase starts.

Second phase
When the Empress is below half health, she will disappear for a second, then reappear above the next estimated location of the player before executing a new set of attacks, with slightly shorter attack intervals than before:


 * 1) Ethereal Lance Ver. 2:  Summons 6 evenly spaced waves of swords that target specific points around the player instead of traveling from one side of the screen to the other. The first wave travels from the left side of the screen to the right of the player, the second wave from the right side to the left of the player, the third wave from top side to the bottom-right of the player, the fourth wave from top side to bottom-left of the player, the fifth wave from the bottom side to top-right of the player, and the sixth wave from the bottom side to top left of the player.
 * 2) Prismatic Bolts
 * 3) Dash Attack
 * 4) Ethereal Lance
 * 5) Everlasting Rainbow
 * 6) Prismatic Bolts
 * 7) Sun Dance
 * 8) Ethereal Lance
 * 9) Dash Attack
 * 10) Prismatic Bolts (Cast in a circle around the Empress instead of a cloud directly above her)

This sequence of attacks will repeat indefinitely until she is defeated.

Armor
Because this fight is particularly difficult, it is recommended to use high tier armor. As Defense is useless in this fight, it is also recommended to maximize DPS instead.
 * Warriors should use a hybrid combo of the, the , and the.
 * Rangers should use a hybrid combo of a, the ,.
 * Mages should use a the with the.
 * Summoners should use the.
 * For all classes, the player can use for the  buff, which allows the player to dodge a hit once every 30 seconds.

Melee

 * The, , and the make great choices. Each sword shoots projectiles, a necessity for this boss fight. The Seedler is a little trickier to use however, as it needs to be aimed more carefully.
 * The is an excellent weapon as it can provide safe distance from the Empress of Light while still being able to attack.
 * The is a useful weapon due to the homing bubbles it launches. However, it is a risky weapon as it has limited range.
 * is the best yoyo available for this fight, but it is incredibly dangerous due to its range.
 * While its healing ability is a little useless here, the are still good due to the fact it launches multiple projectiles.
 * This weapon can only be found in Crimson worlds however.
 * The is very useful due to the homing Tiny Eater's.
 * This weapon can only be found in Corruption worlds however.
 * Both the and the  make useful Boomerangs. The latter has a homing capability while the former has more damage.
 * While the is useless against the boss itself, it is useful for dealing with other attacking enemies.

Ranged

 * The, together with can deal great damage due to the homing capability.
 * The pairs well with, , , and.
 * Exploding Bullets are incredibly dangerous with this weapon due to its high base damage.
 * The has an absurd rate of fire and should be used with s.
 * The should be used with  or.
 * The is useful due to it's massive damage and homing capability. It should also be used with the same Rockets as the Electrosphere Launcher.
 * The should be used with  and.
 * Ichor Arrows can only be made in a Crimson world, unless the player has made a artificial Crimson via the or transporting Seeds. The  can also be used with.
 * The should be used with the.

Accessories

 * Wings are highly recommended. The or  are the best wings available for the fight. Endgame players can use the Lunar Wings instead.
 * The and its tinkers is a useful accessory for using Whips, giving them autoswing and boosting secondary melee weapons used after tagging the Empress.
 * The is a must when using a yoyo for the fight.
 * The is an incredibly useful mobility item due to its dash alongside its dodge chance.
 * The can also be used for added dodge chance.
 * While the and  can allow a player to dodge an attack that would normally instantly kill them, these dodges are chance-based. This makes them inconsistent compared to other dodges such as that granted by the Hallowed Armor.
 * As a ranger, equipping both the and the  will greatly increase DPS. The  and its tinkers should be used if the player is using a bow as their main weapon.
 * The  is a very good choice for all classes due to its large boosts to both offensive and defensive stats.
 * The is a strong magic damage accessory that can be used with Star Statues for mana regeneration.
 * The and the  are good offensive summoner combat accessories, giving a total of 2 extra minion slots along with increased damage.
 * The give a very noticeable ascent speed boost to Wings and some utility on the ground with its extra running speed. They can be used together with a or one of its tinkers for even higher ascent speed.