Cultist of Zariel

Dark Devotion. The cultist has advantage on saving throws against being charmed or frightened.

Ferocious Surge (Recharges after a Short or Long Rest). When this creature hits with an attack that isn't a critical hit, it can turn the hit into a critical hit.

Infernal Tactics. This creature has a keen eye for seizing a tactical advantage. Immediately after rolling initiative, it can choose itself and up to three allies it can see if it isn't incapacitated. It can swap the initiative results of the chosen creatures among them.

Scimitar. Melee Weapon Attack: +3 to hit, reach 5 ft., one creature. Hit: 4 (1d6 + 1) slashing damage.