Medusa

Medusa is a Pre-Hardmode enemy, found at cavern level. Ordinarily a relatively fast-moving melee attacker, Medusa has the ability to inflict the Stoned debuff through her gaze. The debuff's onset is marked by the Medusa's snake hair lashing out red tongues, as well as a unique noise and particle effect, giving players notice before they are petrified. Players facing the Medusa when the animation completes will be turned to stone, completely immobilizing them. Solid blocks between the player and a Medusa can prevent the gaze from inflicting the Stoned debuff, as can simply facing the other direction before the effect is complete.

Tips

 * Facing away from Medusa while fighting off other enemies is recommended.
 * Yoyos, Magic Missile and Flying Knife make great weapons against Medusa as you can use them behind you, and around corners, out of her line of sight. (White String also helps.)

Trivia

 * Medusa is the name of the most well-known of the Gorgons of Greek mythology: a species of creatures who look like women, have living serpents for hair, and cause humans who look at them to turn into stone. According to greek mythology, Medusa was turned into a gorgon by Athena.

History
Médusa