Lord Soth

If Soth fails a saving throw, he can choose to succeed instead.

Soth has advantage on saving throws against spells and other magical effects.

Unless Soth is Incapacitated, he and Undead creatures of his choice within 60 feet of him are immune to features that turn Undead.

Soth doesn't require air, food, drink, or sleep.

Soth makes three Forsaken Brand attacks.

Melee Weapon Attack +12 to hit, reach 5 ft., one target. 10 (1d8 + 6) Bludgeoning damage plus 18 (4d8) Necrotic damage, and if the target is a creature, it can't regain hit points until the start of Soth's next turn.

Soth hurls a magical ball of fire that explodes at a point he can see within 120 feet of himself. Each creature in a 20-foot-radius sphere centered on that point must make a DC 19 Dexterity saving throw. A creature takes 35 (10d6) Fire damage and 35 (10d6) Necrotic damage on a failed save, or half as much damage on a successful one.
Additionally, any Medium or smaller Humanoid killed by this damage, as well as every corpse of such a creature within the sphere, becomes a skeleton (see the Monster Manual) under Soth's control. The skeleton acts on Soth's initiative but immediately after his turn. Absent any other command, the skeleton tries to kill any non-Undead creature it encounters.

Soth points at a creature he can see within 60 feet of himself and magically commands it to die. The target must make a DC 19 Constitution saving throw, taking 100 Necrotic damage on a failed save, or half as much damage on a successful one. If this damage reduces the target to 0 hit points, the target dies.

Soth moves up to his speed or commands a mount he is riding to move up to its speed. The movement from this action doesn't provoke opportunity attacks. If he or his mount moves within 5 feet of a creature during this movement, he can force the creature to make a DC 20 Strength saving throw. The creature is knocked Prone unless it succeeds on the saving throw.

Soth makes one Forsaken Brand attack.

Soth uses Spellcasting.