Vampire Familiar (Swarm of Ravens)

Dark Devotion. The swarm has advantage on saving throws against being charmed or frightened.

Blood Frenzy. The swarm has advantage on melee attack rolls against any creature that doesn't have all its hit points.

Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny raven. The swarm can't regain hit points or gain temporary hit points.

Unnatural Mimicry. The swarm can mimic simple and complex sounds it has heard, such as a person talking, whole phrases, a person crying, or an animal calls. A creature that hears the sounds can tell they are imitations with a successful DC 14 Wisdom (Insight) check.

Domain Misty Escape. When it drops to 0 hit points outside its resting place, the swarm transforms into a cloud of smoky mist instead of falling unconscious, provided that it is within its masters domain. If it can’t transform, it is destroyed. While it has 0 hit points in mist form, it can’t revert to its raven form, and it must reach its resting place within 2 hours or be destroyed. Once in its resting place, it reverts to its raven form. It is then paralyzed until it regains at least 1 hit point. After spending 1 hour in its resting place with 0 hit points, it regains 1 hit point.

Gouging Beaks. Melee Weapon Attack: +5 to hit, reach 5 ft., one target in the swarm's space. Hit: 7 (2d6) piercing damage, the target must make on a DC 13 Constitution saving throw or take 10 (3d6) necrotic damage on a failed save, or half as much damage on a successful one. If the swarm has half of its hit points or fewer, then 3 (1d6) piercing damage, the target must make on a DC 10 Constitution saving throw or take 5 (1d6 + 3) necrotic damage on a failed save, or half as much damage on a successful one.

Enshroud (Recharge 6). The swarm engulfs a creature in a vortex of fast moving shadows before plucking at the target. The target must make a DC 14 Constitution saving throw or be blinded until the end of the swarm's next turn.

Sonic Screech. The swarm screeches out a high pitch horrific noise that almost sounds like blood curdling screams. Each creature within a 10ft radius center on the swarm must make a DC 12 Constitution saving throw, taking 3 (1d6) psychic damage and has disadvantage on their next ability check/attack on a failed save, or half as much damage and no disadvantage on a successful one. Each creature within 20ft of the swarm that can hear its screeches a must succeed on a DC 12 Wisdom saving throw or become frightened until the end of the swarm's next turn. If a creature's saving throw is successful, the creature is immune to this swarm's screech for the next 24 hours.

Seek Blood. As a reaction action, the swarm can move up to its speed toward a hostile creature that it can see.