+1 Longsword of the Medusa

+1 to hit
Damage: 1d8 +1 slashing
On a attack roll of 20 the creature must make a DC 15 Con saving throw in addition to suffering the attack damage. On failed save, the creature is restrained and must make another con sav at the end of each of it's turns, until it had failed or passes 3 more times. If 3 passes the restrained effect ends. If 4 total fails it is petrified for 1 hour.