Tribal Spear

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

Trivia

 * This is the only item with a right-click ability being able to be used as a guest on someone's private island.
 * In that case you can't kill mobs anyway.
 * This is a very cheap and efficent way to stunlock Thorn in catacombs Floor 4.