monster

Swarm of Cranium Rats

CR 5

Medium Swarm of Tiny Beast, Lawful Evil

Reveal Stat Block

Armor Class

Hit Points

36 (8d8)

Speed

30 ft.

str

-1

dex

con

int

wis

cha

Traits

Illumination.As a bonus action, the swarm can shed dim light from its brains in a 5-foot radius, increase the illumination to bright light in a 5 to 20-foot radius (and dim light for an additional number of feet equal to the chosen radius), or extinguish the light.

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.

Telepathic Shroud.The swarm is immune to any effect that would sense its emotions or read its thoughts. as well as to all divination spells.

Actions

Bites.mw 5 to hit, reach 0 ft., one target in the swarm's space. ({@damage 4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half of its hit points or fewer.