Anvil of Magic Weapons

A masterwork anvil engraved with adamantine.

The Anvil has 5 charges.

when a nonmagical weapon is put on the anvil if it is hammered for half a minute, this expands 1 charge and makes the weapon magical, giving it +1 to attack and damage rolls. 

The anvil regains all it's lost charges at dawn.

Notes: Creation, Buff, enchantment