Silver

Silver is a moderately rare metal found in the overworld and Nidavellir. Like most metals, it can be fashioned into tools, armour and its own block. Silver, when used in tools, has a unique property: their efficiency is directly tied to the moon phase, being more efficient than diamond at full moon but less efficient than stone at new moon. Silver is not the most durable metal, being moderately less durable than iron, however, its enchantebility is amongst the best in the game. Silver swords also have bonus damage when used against undead mobs. Note that enchanting a silver tool will lock its efficiency to whatever moon phase it was during the enchantment, but that isn't the case for swords. Silver is found at levels 1 to 32, same as gold, and like gold, rings of silver exist, which can be smelted into silver nuggets.