Crypt Wight

Brute. A melee weapon deals one extra die of its damage when the Crypt Wight hits with it (included in the attack).

Magic Resistance. The Crypt Wight has advantage on saving throws against spells and other magical effects.

Rejuvenation. If the Crypt Wight dies, it reforms in 1 hour, regaining all its hit points and becoming active again. The Crypt Wight reforms inside their burial place.

Life Drain. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 8 (1d6 + 4) necrotic damage. The target must succeed on a DC 13 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Morningstar. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) piercing damage. If the attack is a critical hit against a creature, that creature is knocked 10 feet backwards and falls prone. 

Sweeping Attack (Recharge 6). The Crypt Wight makes a Morningstar attack against each creature within range.

Horrifying Visage. Each non-undead creature within 30 feet of the Crypt Wight that can see it must succeed on a DC 13 Wisdom saving throw or be frightened for 1 minute. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to the Horrifying Visage of all Crypt Wights for the next 24 hours.