Mythscourge

Weapon (dagger), legendary

The mythscourge is a fearsome spike whose sole purpose is the nullification of all god-like power.

Close to the spike’s bottom, an elaborate iron fretwork serves as a firm handle. The mythscourge has the same stats as a +3 dagger and deals an additional 9 (2d8) damage against creatures that can take legendary actions. Godlike creatures damaged by a mythscourge must make a DC 15 Wisdom saving throw or be unable to use their legendary actions for 1 round. If you score a critical hit on a creature that can take legendary actions with the mythscourge, it is unable to use its legendary actions powers for 1 minute on a failed saving throw, or for 1 round even on a successful saving throw.