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Hulk Rat-King

Medium beast (swarm), unaligned

AC
13
HP
105
Speed
30
CR
3

The customs hulk was condemned, sealed, and left to the rats, and the rats held a parliament. A hulk rat-king is that parliament given teeth: dozens of bodies knotted tail to tail, moving as one grey tide through the bilges and the mud. Where it passes, the filth of the wreck passes with it, and the fever follows close behind.


Armor Class 13 (natural armor)

Hit Points 105 (14d8 + 42)

Speed 30 ft., climb 20 ft.


STR
14 (+2)
DEX
15 (+2)
CON
16 (+3)
INT
3 (-4)
WIS
12 (+1)
CHA
5 (-3)

Damage Resistances bludgeoning, piercing, slashing

Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned

Senses darkvision 60 ft., passive Perception 11

Languages —

Challenge 3


Traits

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

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

Actions

Mass Bites. Melee Attack Roll: +4, reach 5 ft. Hit: 16 (4d6 + 2) Piercing damage plus 5 (2d4) Poison damage, and the target must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its next turn.

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022