Frozen Water Pungi

The Frozen Water Pungi is a item. It can be used to stop a Living Metal Snake, allowing it to be mined.

Trivia
Despite the item description's encouragement to work with another player, Living Metal Hearts can also be obtained solo by holding the Frozen Water Pungi, switching to a pickaxe, mining the tail, then switching back to the pungi before the snake can move. Repeat this process until the head is destroyed.