Vampire's Thrall

Fey Ancestry. The thrall has advantage on saving throws against being charmed, and magic can’t put the thrall to sleep.

Innate Spellcasting. The thrall's spellcasting ability is Charisma (spell save DC 14). He can innately cast the following spells, requiring no verbal components:

At will: booming blade, and control flames, minor illusion, mold earth, shape water, thunderclap

1/day each: darkness, counterspell, hypnotic pattern, misleadand a reduced version of Insect Plague that only does 1d10 piercing damage per round.

Multiattack.  The Thrall makes two attacks per round, one with his glaive and one with his Ranged Flame attack.

Glaive, +1. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 8 (1d10 + 4) slashing damage.

Flame of the Hand. Ranged Spell Attack: +5 to hit, range 30 ft., one target. Hit: 10 (2d8 + 2) fire damage

Poison Spew.  As a bonus action, the Thrall may spit a poison at a target that is within 10'.  The target of this poison will suffer (2d8) poison damage, or half with a DEX save (DC 14).  This attack may only be used every other round.

Swarm of Rats. Once per long rest, the Thrall can summon a Swarm of Rats.  This swarm is under his control as long as he is conscious, following simple mental commands to attack or defend.  The swarm of rats will remain within 30' of the Thrall at all times, until they are destroyed.  Anyone within the swarm makes ranged attacks and spell attacks that rely on vision at disadvantage.