Multiattack

The herald of darkness uses Majesty of the Abyss, if it is available, and makes one melee attack.

Embrace Darkness

Melee Weapon Attack. +8 to hit, reach 5 ft., all creatures in reach. Hit: 6 (1d12) necrotic damage and targets are paralyzed until the start of the herald's next turn. Making a DC 17 Constitution saving throw negates the paralysis.

Majesty of the Abyss (Recharge 4-6)

The herald of darkness emits a sinister burst of infernal power. All creatures within 30 feet and in direct line of sight of the herald take 19 (3d12) necrotic damage and must make a DC 17 Constitution saving throw. Those who fail the saving throw are blinded for 2 rounds; those who succeed are frightened for 2 rounds.

Shadow Sword

Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 18 (2d12 + 5) slashing damage.