Medusa

Medusa is a Pre-Hardmode enemy, found at cavern level, that inflicts the Stoned debuff if the player is facing her. The debuff immobilizes the player and encases them in a pile of stone. While the stoned debuff is active, fall damage is increased, even with items that negate fall damage, such as the lucky horseshoe. 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 unless she's being attacked, making her very difficult to fight. She drops around 10 silver coins upon death (roughly 25 silver in an Expert world), as well as a chance of a Medusa Head to drop.