A Swarm of Cranium Rats | Monster (2020) | Dungeons & Dragons 5e | Statblocks & Sheets | World Anvil

Remove these ads. Join the Worldbuilders Guild

A Swarm of Cranium Rats CR: 5 (1,800XP)

Tiny swarm of beasts, lawful evil
Armor Class: 12
Hit Points: 36 (8D8)
Speed: 30 ft.


9 -1


14 +2


10 +0


15 +2


11 +0


14 +2

Damage Resistances: Bludgeoning,Piercing and Slashing
Condition Immunities: Charmed,Frightened,Grappled,Paralyzed,Petrified,Prone,Restrained and Stunned
Senses: Darkvision 30ft, and Passive Perception 10.
Languages: Telepathy 30ft
Challenge Rating: 5 (1,800XP)

Innate Spellcasting (Psionics)

The Swarm’s innate Spellcasting Ability is Intelligence (Spell Save DC 13). As long as it has more than half of its Hit Points remaining, the swarm can Innately cast the following spells, requiring No Components.

At will:
  • Command
  • Comprehend Languages
  • Detect Thoughts

  • Confusion
  • Dominate Monster


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 5-20-Foot Radius (And Dim Light for an additional number of feet equal to the Chosen Radius), or Extinguish the Light.    


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.  



Melee Weapon Attack: +5 To Hit, Reach 0ft, One Target in the swarm's space. Hit: 14 (4D6) Piercing Damage, or 7 (2D6) Piercing Damage if the swarm has half of its Hit Points or fewer.   

Suggested Environments

The Underdark.

Created by

Loremaster Aemon.

Statblock Type

Monster (2020)