Crannock

Multiattack. Crannock makes two attacks with his handaxes 

Handaxe. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:  9 (1d8 + 4) slashing damage. 

Infernal Conduit (1/Day). Melee Spell Attack: +6 to hit, reach 5 ft., one creature. Hit: 22 (4d10) necrotic damage, and Crannock regains hit points equal to the damage taken.

Baleful Interdict (3/Short or Long Rest). As a bonus action, Crannock places seals on a creature within 30 feet of him that he can see. He has three of these seals which recharge on a Short or Long Rest. When Crannock or one of his allies hits a target with at least one seal with a melee attack, he can consume the seals to deal an extra 7 (2d6) necrotic damage per seal consumed.

By the Throat. As a bonus action, Crannock uses Baleful Interdict to place a seal on a Large or smaller creature. The target must succeed on a DC 15 Wisdom saving throw or be grappled (escape DC 15). While grappled, the target is restrained.

Infernal Recharge (1/day). As a bonus action, Crannock can regain 1d3 seals if he has expended all his seals.  

Telekinetic Seal. When a creature moves within 5 feet of Crannock, he can use Baleful Interdict to place a seal on it. The target must succeed on a DC 15 Wisdom saving throw or be pushed 30 feet away from Crannock and knocked prone.