Tribal Spear

The Tribal Spear is a Sword purchased from  for  and. It has. The  pierces through infinite mobs, travelling 20 blocks.

Trivia

 * This is the only item with a  being able to be used as a guest on someone's Private Island.
 * However, they cannot damage mobs.
 * This is a very cheap and efficent way to stunlock Thorn in The Catacombs - Floor IV. If Thorn gets un-stunlocked, he will move faster making it almost impossible to hit thorn.
 * Multiple Spears can be thrown at once.