Skeletal Rats

Medium Undead, Unaligned

AC: 10

Initiative: +0 (10)

HP: 24 (7d8 - 7)

Speed: 30 ft.

STR
9 (-1)
DEX
11 (+0)
CON
9 (-1)
INT
2 (-4)
WIS
10 (+0)
CHA
3 (-4)

Resistances: bludgeoning; piercing; slashing

Condition Immunities: charmed; frightened; grappled; paralyzed; petrified; prone; restrained; stunned

Senses: darkvision 30 ft., Passive Perception 10

CR: 1/4 (XP 50; PB +2)

Habitat: Swamp, Urban

Keen Smell.

The swarm has advantage on Wisdom (Perception) checks that rely on smell.

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 rat. The swarm can't regain hit points or gain temporary hit points.

Actions

Bites.

Melee Weapon Attack: +2 to hit, reach 0 ft., one target in the swarm's space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer.

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Skeletal Rats

Source: Baldur's Gate: Descent Into Avernus, p. 23 - Licenses and attribution