Ball 'O Hurt

An item obtained by smashing a Shadow Orb with a hammer. Similar physics to the Grappling Hook. It also puts off small particles similar to the ones put off by objects in corruption. It extends to a certain length and then drops like it is affected by gravity. Automatically retracts if it hits a block or runs out of length.

It is particularly useful when fighting Bone Dragons or the Eater of Worlds boss, since it does relatively constant damage once you fire it.