Mummy

The mummy makes two attacks and uses .

. . If the target is a creature, it is cursed. While cursed, the target can't regain Hit Points, its Hit Point maximum doesn't return to normal when finishing a Long Rest, and its Hit Point maximum decreases by {10 (3d6)} every 24 hours that elapse. A creature dies and turns to dust if reduced to 0 Hit Points by this attack.

Wisdom Saving Throw: DC , one the monster can see within feet.
Failure: The target has the Frightened condition until the end of the monster's next turn.
Success: The target is immune to this monster's Dreadful Glare for 24 hours.