Engulfing Protoplasm

Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 19 (2d12 + 6) slashing damage and the target must make a successful DC 17 Dexterity saving throw or be grappled by the herald of blood (escape DC 16). While grappled this way, the creature takes 39 (6d12) acid damage at the start of each of the herald's turns. The herald can have any number of creatures grappled this way.