Skeletal Swarm

Large Undead, Lawful Evil

STR
12 (+1)
DEX
14 (+2)
CON
15 (+2)
INT
6 (-2)
WIS
8 (-1)
CHA
5 (-3)
Deafening Clatter.

Creatures are deafened while in the swarm's space.

Swarm.

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

Actions

Slash.

Melee Weapon Attack: +4 to hit, reach 0 ft., one target in the swarm's space. Hit: 11 (2d8 + 2) slashing damage, or 6 (1d8 + 2) slashing damage if the swarm has half of its hit points or fewer.

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Skeletal Swarm

Source: Ghosts of Saltmarsh, p. 254 - Licenses and attribution