Multiattack

The herald makes three Herald's Staff or Blood Bolt attacks, or it makes two Herald's Staff attacks and one Grasping Slam attack.

Herald's Staff

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 13 (2d6 + 6) bludgeoning damage plus 13 (3d8) necrotic damage.

Grasping Slam

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) bludgeoning damage, and the target is grappled (escape DC 17) if it is a Large or smaller creature. Until this grapple ends, the target is restrained and takes 9 (2d8) necrotic damage at the start of each of its turns, and the herald can't use its Grasping Slam on another target.

Blood Bolt

Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 25 (5d8 + 3) necrotic damage. If the target is a creature with blood, it must succeed on a DC 17 Constitution saving throw or be poisoned until the end of its next turn.

Call Blood (Recharge 5-6)

Each creature with blood within 10 feet of the herald must make a DC 17 Constitution saving throw, taking 45 (10d8) necrotic damage on a failed save, or half as much damage on a successful one. The herald then gains temporary hp equal to the single highest amount of necrotic damage dealt. A creature that fails the saving throw by 5 or more also suffers one level of exhaustion.