Terraprisma

The Terraprisma is a Hardmode summon weapon dropped by the Empress of Light boss.

Trivia

 * Although its sprite appears to be a Sword, it is actually a Summoning Weapon. This is similar to the Sky Fracture, which looks like a sword but is a Magic weapon.
 * It will only be dropped by the Empress if she is damaged and killed during the day, when her attacks do increased damage.
 * Despite the weapon's tooltip, the summoned minions look neither like the Enchanted Sword item or the Enchanted Sword enemy.