Horde of Shadows

The horde can pass through an opening as narrow as 1 inch wide without squeezing.

The horde takes double damage from any effect that targets an area.

The horde is composed of 5 or more shadows. If it is subjected to a spell, attack, or other effect that affects only one target, it takes any damage but ignores other effects. It can share its space with Medium or smaller creatures or objects.

When the horde is reduced to 0 hit points, it turns into 2 (1d4) shadows, each of which are bloodied.

While in sunlight, the horde has disadvantage on attack rolls, ability checks, and saving throws.

The horde doesnt require air, sustenance, or sleep.

Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 16 (4d6 + 2) necrotic damage and the target makes a DC 12 Constitution saving throw. On a failure the target is cursed until it finishes a short or long rest or is the subject of remove curse or a similar spell. While cursed the target makes attack rolls Strength checks and Strength saving throws with disadvantage. If the target dies while cursed a new undead shadow rises from the corpse in 1d4 hours the corpse no longer casts a natural shadow and the target can't be raised from the dead until the new shadow is destroyed.

The horde makes up to three claw attacks but no more than one against each target.

The horde takes the Hide action even if obscured only by dim light or darkness.