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Plague Rat Swarm in Dungeons & Dragons 5e

Homebrew

Plague Rat Swarm CR: 1/2

Medium undead, rodent, unaligned
Armor Class: 12
Hit Points: 24
Speed: 30 ft , climb: 20 ft

STR

9 -1

DEX

14 +2

CON

12 +1

INT

2 -4

WIS

10 +0

CHA

3 -4

Skills:

Swarm

The swarm can occupy another creature’s space and vice versa. The swarm can move through any opening large enough for a Tiny rat. The swarm cannot regain hit points or gain temporary hit points.  

Diseased Bodies

A creature that starts its turn in the swarm’s space must succeed on a DC 11 Constitution saving throw or take 2 poison damag
Damage Resistances: Bludgeoning, Piercing, Slashing
Condition Immunities: Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned, Poisoned
Senses: Darkvision 30 ft., passive Perception 10
Challenge Rating: 1/2

Actions

Bites

Melee Weapon Attack: +4 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 10 piercing damage, or 5 piercing damage if the swarm has half its hit points or fewer. The target must succeed on a DC 11 Constitution saving throw or become poisoned until the end of its next turn.

A mass of diseased rats drawn to infected grain. Their eyes are milky, their bodies twitch, and many are already half-dead. They spill from grain sacks, cellars, wagons, and sewer drains.

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