Swarm of Rats in Dungeons & Dragons 5e
Homebrew, Monster Manual (5e), 2014, Monster Manual (5.5e), 2025
Swarm of Rats CR: 1/4
STR
9 -1
DEX
11 +0
CON
9 -1
INT
2 -4
WIS
10 +0
CHA
3 -4
Darkvision 30 ft, Passive Perception 10
Keen Smell. The swarm has advantage on Wisdom (Perception) checks that rely on smell.
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.
Actions
Bites. Melee Attack Roll: +2, reach 5 ft. Hit: 5 (2d4) Piercing damage, or 2 (1d4) Piercing damage if the swarm is Bloodied.
- Diseased (Optional). If the target is a creature, it must succeed on a DC 10 Constitution saving throw or contract a disease. Until the disease is cured, the target can't regain hit points except by magical means, and the target's hit point maximum decreases by 3 (1d6) every 24 hours. If the target's hit point maximum drops to 0 as a result of this disease, the target dies.
Suggested Environments
Any climate; Forest, swamp, Underdark, & urban terrain
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