Basilisk Dagger (Patreon)

Weapon (dagger), rare

This magic dagger was made from pieces of a slain basilisk and still retains some of its properties. The dagger deals an extra 1d4 poison damage to any target it hits.

In addition, whenever you score a critical hit using this weapon against a creature, that creature is forced to make a DC 14 Constitution saving throw. On a failed save, that creature becomes restrained as it magically begins to turn to stone. If it failed the saving throw, the creature must repeat the saving throw at the start of your next turn. On a success, the effect ends, and it is no longer restrained. On a failure, the creature is petrified for 1 minute or until freed by the greater restoration spell or other magic.

Once this property of the dagger has been used, it can't be used again in this way for 1 minute. A creature is immune to this effect if it is immune to damage of the weapon’s type, does not have a body made of flesh, or has legendary actions. 

"Are you sure this...thing...is safe?"

"Of course! It's perfectly safe."

"But what happens if it looks at me?"

"Nothing. Its magic only works if you're the one on the other side of the pointy bit."

"...If you say so...."