Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Stench. Any non-undead that starts its turn within 30 feet of the lord must succeed on a DC 15 Constitution saving throw or be poisoned until the start of its next turn. On a successful saving throw, the creature is immune to the Lord's Stench for 24 hours.

Multiattack. The lord makes two attacks, only one of which can be a Anti-Life touch.

Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage.

Anti-life Touch. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) necrotic damage. If the target is a creature, it must succeed on a DC 15 Constitution or  the target's hit point maximum is reduced by an amount equal to the necrotic damage taken. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. A humanoid slain in this way rises 24 later as Zombie under the lord´s control, unless the humanoid is restored to life or its body is destroyed. The lord can have no more than forty zombies under its control at one time.

The lord can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The mummy lord regains spent legendary actions at the start of its turn.

Assemble Hordes. The lord telepathically commands all zombies it controls within 1 mile to immediately move up to half their speed. A zombie that moves out of an enemy’s reach because of this movement doesn’t provoke an opportunity attack.

Anti-life Touch (Costs 2 Actions). The lord makes a anti-life touch attack.

Rise Zombies (Costs 3 Actions). . The lord targets a humanoid corpse within 30 feet, which rises as a zombie under the lord’s control