monster

Cranium Rat Squeaker Swarm

CR 5

Medium Swarm of Tiny Aberration, Neutral

Reveal Stat Block

Armor Class

Hit Points

76 (17d8)

Speed

30 ft.

str

-1

dex

con

int

wis

cha

Traits

Psychic Messenger.The swarm can use its sending spell to target someone familiar to a creature in telepathic contact with the swarm.

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 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, plus 22 (5d8) psychic damage.

Cranium Rat Squeaker Swarm

The cranium rats squeakers of Sigil have no connection to the mind flayers that created their progenitors. Rather, these magical rodents cooperate with the residents of the City of Doors, whether by simply living together or by pursuing greater ambitions. When squeakers collect in large numbers, their swarms merge into a single intelligence with enhanced psionic abilities and the accumulated memories of its constituents.