# [Swarm of Rats](Rules\Source\bestiary\beast/swarm-of-rats-xmm.md)
*Source: Monster Manual (2024) p. 370. Available in the <span title='Systems Reference Document (5.2)'>SRD</span> and the Free Rules (2024)*
## Animals
Use these stat blocks to represent the creatures they're named for or other similar creatures. For example, the [Panther](/Rules/Source/bestiary/beast/panther-xmm.md) stat block can also represent a mountain lion, while the [Giant Goat](/Rules/Source/bestiary/beast/giant-goat-xmm.md) stat block might represent a buffalo. Any of these stat blocks might also serve as fantastical animals with distinctive names and cosmetic details unique to your D&D adventures.
```statblock
"name": "Swarm of Rats (XMM)"
"size": "Medium"
"type": "beast"
"alignment": "Unaligned"
"ac": !!int "10"
"hp": !!int "14"
"hit_dice": "4d8 - 4"
"modifier": !!int "0"
"stats":
- !!int "9"
- !!int "11"
- !!int "9"
- !!int "2"
- !!int "10"
- !!int "3"
"speed": "30 ft., climb 30 ft."
"damage_resistances": "bludgeoning, piercing, slashing"
"condition_immunities": "[charmed](/Rules/Source/conditions.md#Charmed), [frightened](/Rules/Source/conditions.md#Frightened),\
\ [grappled](/Rules/Source/conditions.md#Grappled), [paralyzed](/Rules/Source/conditions.md#Paralyzed),\
\ [petrified](/Rules/Source/conditions.md#Petrified), [prone](/Rules/Source/conditions.md#Prone),\
\ [restrained](/Rules/Source/conditions.md#Restrained), [stunned](/Rules/Source/conditions.md#Stunned)"
"senses": "[Darkvision](/Rules/Source/senses.md#Darkvision) 30 ft., passive Perception\
\ 10"
"languages": ""
"cr": "1/4"
"traits":
- "desc": "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](/Rules/Source/variant-rules/hit-points-xphb.md)\
\ or gain [Temporary Hit Points](/Rules/Source/variant-rules/temporary-hit-points-xphb.md)."
"name": "Swarm"
"actions":
- "desc": "*Melee Attack Roll:* +2, reach 5 ft. *Hit:* 5 (2d4) Piercing damage,\
\ or 2 (1d4) Piercing damage if the swarm is [Bloodied](/Rules/Source/conditions.md#Bloodied)."
"name": "Bites"
"source":
- "XMM"
"image": "/Rules/Source/bestiary/beast/token/swarm-of-rats-xmm.webp"
```
^statblock
## Environment
forest, swamp, underdark, urban