Litho's Armory/WX Sword

The WX Sword is a craftable hardmode broadsword. When swung, it fires out two sword beams in the shape of a W and an X.

Trivia

 * The item itself is a reference both to a Vinesauce corruption from this video, and this fanart depicting the corrupted sword.
 * Its tooltip references the glitched item drop, often read as "Wolflobe", from Chrono Trigger, and was a quote by Vinesauce Vinny in the video linked above.