The anvil can be used in several ways. You can use it to rename an item, which is done by plopping said item onto it and typing in a new name. It costs at least one level to do this, though, so ...

This new pixel indie game Humble Bundle includes Celeste, Rivals of Aether, ... Anvil Saga, along with a range of others that are worth $146 / £113.03 in total. ...