Blood Seneschal

Retainer. The retainer has the same level and proficiency bonus as its mentor. It has proficiency in Medicine and Persuasion checks, as well as in all saving throws.
It also has a number of hit points equal to 7 times their level, as well as a number of d8 hit dice equal to its level.

7th level: Multiattack. The seneschal makes two Blood Curse attacks.

Signature Attack (Blood Curse). Melee or Ranged Spell Attack: +3 plus PB to hit, reach 5 ft. or range 60ft., one target. Hit: 1d4 plus PB necrotic damage, and the target is poisoned until the end of the seneschal's next turn.

3rd Level: Coagulate (3/Day). As an action, the seneschal empowers the blood of up to PB creatures within 30 feet of them. Each target can expend 1 Hit Die, rolling it and regaining hit points equal to twice the result plus their Constitution modifier.

5th Level: Blood Puppet (3/Day). As an action, the seneschal chooses a creature they can see within 60 feet of them. The target must succeed on a DC 10 plus PB Wisdom saving throw or move up to their speed in a direction of the seneschal’s choice. During this movement, the seneschal can force them to make one attack against a creature of the seneschal’s choice (no action required).

7th Level: Blood Bondage (1/Day). As an action, the seneschal arrests the hearts of up to PB creatures within 30 feet of them. Each target must make a DC 10 plus PB Constitution saving throw. On a failed save, a creature takes PBd6 necrotic damage and is paralyzed for 1 minute (save ends at end of turn). On a successful save, a creature takes half as much damage and isn’t paralyzed.