Sluagh

The Sluagh are a host of restless dead moving like a flock of black birds across the western sky. They enter through open windows, carry away weakened souls, and descend upon houses where death is near. Faces, wings, and grasping hands move as one body, separating from the host only when they close around someone.

Soul-Sweeping Flight: creatures in a 40 ft line make a Quick save. A failure deals 3d8 necrotic damage and carries the creature 20 ft with the host.

Close the Western Window: the Sluagh cannot cross a completely sealed western-facing opening. Bells rung by three living creatures remove its DR for 2 rounds.