Litho's Armory/Light of Ruin

The Light of Ruin is a craftable hardmode broadsword. When it's swung, it shoots a spinning blade of light that gradually slows down which can inflict the Daybroken debuff on enemies. The sword itself can inflict both Wildfire and Daybroken.

Trivia

 * Light of Ruin is a reference to an unreleased Fairy-type Pokémon move of the same name. However, the name is the only relation.