Medusa

Medusa is a Pre-Hardmode enemy found Underground that inflicts the Stoned debuff if the player is in sight. As soon as the debuff wears off (around 3-4 seconds), Medusa will reapply the debuff until the player is killed or out of sight, making her very difficult to fight. She drops around 16 siver coins upon death as well as a chance of a Medusa's head to drop.