Swarm of Rats
Medium Swarm of Tiny Beasts · · CR 1/4
- Swarm of Tiny Beasts
- Medium
- Tier 1
CR 1/4 medium swarm of tiny beasts, unaligned — that's Swarm of Rats. Native to swamp and urban. Sourced from Monster Manual (5e 2014) and Monster Manual (5.5e 2024).
Stat Block
- Challenge Rating
- 1/4
- Type
- Swarm of Tiny Beasts
- Size
- Medium
- Alignment
- —
- Speed
- —
- Habitats
- Swamp, Urban
- Sources
- Monster Manual (5e 2014), Monster Manual (5.5e 2024)
Ecology
Rats follow humanoid civilization wherever it spreads, exploiting grain stores, refuse heaps, and sewage systems. A breeding pair produces dozens of offspring per year, and uncontrolled populations explode within weeks. Rat swarms form in plague conditions when food is abundant or when a single warren is disturbed. They carry diseases between hosts, making them ecological vectors as much as predators. Cats, weasels, and certain owls suppress populations, but rats persist anywhere humans live.
Behaviour
Rats are intelligent for their size, capable of solving puzzles and recognizing individual humans. A swarm acts on collective instinct, fleeing or attacking based on shared scent cues. They prefer dim, enclosed spaces and avoid direct daylight. Bold swarms enter homes through walls and floors, and they remember escape routes. Some city watches employ trained rat-catchers who command small swarms as living lockpicks for tight spaces.
Origin
Rats are the great commensal of mortal civilization, traveling on every cart and ship since the first cities rose. No origin myth claims them as divine; they are simply ubiquitous. Wererat scholars argue rats are the rightful inheritors of every fallen empire and that lycanthropy among humans merely formalizes a pre-existing alliance between species. Most cities reject this claim but quietly tolerate the wererat thieves' guilds nonetheless.
Related Monsters
Frequently Asked Questions about Swarm of Rats
- What is the challenge rating of Swarm of Rats?
- On the bestiary CR scale, Swarm of Rats sits at 1/4. It works against low-level groups.
- What type of creature is Swarm of Rats?
- By creature type, Swarm of Rats is a swarm of tiny beasts, medium size.
- Where does Swarm of Rats live?
- Swarm of Rats is typically encountered in Swamp, Urban.