Pack Tactics. The cult warlord has advantage on an attack roll against a creature if at least one of the warlords allies is within 5 feet of the creature and the ally isn't incapacitated.

Devotion. The cult warlord cannot be charmed or frightened.

Why are they so lazy.(1/day)  The cult leader can give all cultists within 60 feet of it a bonus of 1d8 to their attack rolls, saving throws, and ability checks for 1 minute.

Multiattack. The cult warlord makes three Rapier attacks.

Rapier. Melee weapon attack: +9 to hit, 5 ft, 1 target, 13 (1d8 + 9)  piercing damage.

Dark Demise (2/SR). The cult warlord hurls a ball of white-hot energy at a point within 50 feet of it. Any creatures within 10 feet of that point must make a DC 16 Dexterity saving throw,  taking 14 (4d6) force damage, 14 (4d6) necrotic damage,  14 (4d6) lightning damage, and 14 (4d6) fire damage on a failed save or half as much damage on a successful one.

Swap. The cult leader swaps places with one willing cultist within 30 feet of it.

Parry. The cult leader parries a blow, granting it a +5 bonus to AC against the triggering attack.

The cultist has 3 legendary actions.

1 action: The cultist makes one rapier attack against a hostile creature within 5 feet of it.

1 action: The cultist teleports up to 30 feet.

2 actions: Combination of the first two.

3 actions: The cultist becomes invisible until the end of the cultist's next turn.