Multipurpose Stone Anvil

From Rebirth of the Night Wiki

A multipurpose stone anvil can be used in conjunction with a hammer to break some materials and items down to smaller parts, which can then be used for further crafting.

Most notably in the early game, it can be used with copper and tin to create pebbles which can then be made into bronze in a kiln.

To use the multipurpose stone anvil, hold the item you want to break down and right-click the anvil with it. Then hold a hammer in your hand and right-click the anvil with it repeatedly until the item breaks down.