Medusa is a pre-hardmode enemy which turns players into a stone for a short period of time. It spawns in The Underground in the Marble Sub-biome. While the player is turned to stone, fall damage is greatly increased.The Medusa also spawns in the Granite Sub-biome.
If you are killed by fall damage whilst stoned, the death message will say "<PLAYER NAME> was slain." instead of the normal fall damage death message.