Terraprisma

The Terraprisma is an aerial Hardmode post-Plantera summon weapon. It spawns a detached copy of itself that rapidly slashes and stabs at nearby enemies. It is dropped from the Empress of Light only when all damage dealt to the Empress occurs during the daytime, when she is enraged and all her attacks instantly kill the player.

Tips

 * A reliable strategy for defeating the Empress of Light during the day is to build a skybridge out of Asphalt Blocks. When the fight begins, use the Hermes Boots (or one of its tinkers) and Swiftness Potions to run across the skybridge while damaging the Empress with a long-range weapon. This will allow the player to easily dodge attacks while damaging the Empress from a safe distance. A good weapon choice would be the Chain Gun or Megashark with Chlorophyte Bullets, as dodging should be the player's main focus during the fight.
 * A disadvantage of using a skybridge is that it is possible to reach the end, forcing the player to turn around. This has a high risk of death, as the Empress of Light will easily catch up to the player. This can be circumvented by using a Rod of Discord to teleport around the Empress.
 * An alternative to using a skybridge built from Asphalt Blocks is to use Minecart Tracks in a large loop. Booster Tracks can also be used to quickly accelerate to full speed upon summoning the Empress. This will also prevent other enemies from spawning on the bridge, which can cause issues during the fight. This is especially helpful on Expert or Master mode since the Mechanical Cart is available.

Trivia

 * Although its sprite appears to be a sword, it is actually a summon weapon. This is similar to other sword lookalikes such as the Sky Fracture, which is actually a magic weapon, and the Durendal, which is actually a whip.
 * Despite their name, the summoned minions look nothing like the Enchanted Sword item or the Enchanted Sword enemy.
 * The Terraprisma has the highest base damage of all minion summon weapons despite being obtainable pre-Golem and only having a rarity of . This is most likely due to the high difficulty of fighting the Empress of Light during the day.
 * The Terraprisma is the only minion-summoning weapon that does not have the word "staff" in its name.
 * The way the sword attacks, pursues, and follows could be a reference to the Sword Familiar found in the game.