Mummy

The mummy makes two Rotting Fist attacks and uses Dreadful Glare.

Melee Weapon Attack: +5 to hit, reach 5 ft.. Hit: 8 (1d10 + 3) bludgeoning plus 10 (3d6) necrotic damage. 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 11, one creature the mummy can see within 60 feet.
Failure: The target has the Frightened condition until the end of the mummy's next turn.
Success: The target is immune to this mummy's Dreadful Glare for 24 hours.