Cobbleswarm — fantasy monster illustration. Cobbleswarm is a medium swarm (Challenge Rating 2).

Image: FTTHelper

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Cobbleswarm

Medium Swarm, Unaligned

AC
15
HP
36
Speed
30
CR
2

False


Armor Class 15 (natural armor)

Hit Points 36 (8d8)

Speed 30 ft.


STR
12 (+1)
DEX
11 (+0)
CON
11 (+0)
INT
5 (-3)
WIS
12 (+1)
CHA
5 (-3)

Damage Vulnerabilities False

Damage Resistances bludgeoning, piercing, slashing

Damage Immunities False

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

Senses passive Perception 11

Languages

Challenge 2


Traits

False Appearance. While the cobbleswarm remains motionless, it is indistinguishable from normal stones.

Shifting Floor. Whenever the cobbleswarm moves into a creature's space or starts its turn in another creature's space, the creature must succeed on a DC 13 Dexterity saving throw or fall prone. A prone creature must succeed on a DC 13 Dexterity (Acrobatics) check to stand up in a space occupied by the swarm.

Swarm. The cobbleswarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny stone. The swarm can't regain hp or gain temporary hp.

Actions

Stings. Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm's space. Hit: 15 (6d4) piercing damage, or 7 (3d4) piercing damage if the swarm has half its hp or fewer.

Bonus Actions

Shift and Tumble. The cobbleswarm pushes a prone creature in its space up to 5 feet away from it.

Community Images

Cobbleswarm — fantasy monster illustrationPrimary
FTTHelper · auto-generated · monster · monster

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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