Swarm of Undead Rats

Family: Swarm

Medium swarm of Tiny undead, chaotic evil

Armor Class 10
Hit Points 24 (7d8 – 7)
Speed 30 ft.

9 (–1) 11 (+0) 9 (–1) 2 (–4) 10 (+0) 3 (–4)

Damage Resistances bludgeoning, piercing, slashing
Damage Immunities poison
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, poisoned, prone, restrained, stunned
Senses darkvision 30 ft., passive Perception 10
Challenge 1/4 (50 XP)


  • Keen Smell. The swarm has advantage on Wisdom (Perception) checks that rely on smell.
  • Swarm. The undead rat 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.


  • Bites. Melee Weapon Attack: +2 to hit, reach 0 ft., one creature 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.


An swarm of undead rats consists of hundreds of undead rodents that squirm and writhe as if alive, until you stop to look at their broken bodies and lifeless eyes. Their insides ooze through their fur, making them a disgusting mass to deal with.

Section 15: Copyright Notice

Tome of Horrors 2020, (C) 2020, Necromancer Games

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