Tombstones

A Tombstone drops when a player with the mediumcore or hardcore setting on dies. It can then be retrieved and used much like a sign.

Tombstones can be easily farmed by placing Hellstone or Meteorite directly under the spawn and then creating a new mediumcore character. The player will die, create a tombstone and then he will spawn again and die again. This can also be done by digging straight down from the spawn so the newly spawned player will die from Fall Damage.

Upon death, the tombstone will bounce around for a moment, dealing 50 damage to enemies, and then place itself on a nearby 2-block-wide free space. Two tombstones cannot land on each other, nor can they be retrieved if they fail to place themselves (e.g., due to lack of suitable space). Therefore, it's recommended to have an open wide and flat area if you are going to farm tombstones.