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Cobbleswarm

Medium · Monstrosity · CR 2 · Unaligned

Source. Tome of Beasts 1 (2023 Edition)

15 (natural armor)

36 (8d8)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

-3

WIS

CHA

-3

Overview

Category Monsters

Size Medium

Type Monstrosity

Alignment Unaligned

XP 450

Initiative Bonus +0

Movement

Walk 30 ft (9.1 m)

Swim 15 ft (4.6 m)

Climb 15 ft (4.6 m)

Crawl 15 ft (4.6 m)

Senses

Passive Perception 11

Resistances & Immunities

Damage Resistances

bludgeoning, piercing, slashing

Condition Immunities

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

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

+3 to hit. Hit: 6d4 piercing damage.

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.

About Cobbleswarm

Cobbleswarm is a medium monstrosity with a Challenge Rating of 2. It has a unaligned alignment.

In combat, this creature maintains an Armor Class of 15 and possesses 36 hit points (derived from 8d8).

GM Tips: Using Cobbleswarm

2 tips available

When using Cobbleswarm in your D&D 5e campaign, consider these tactical approaches:

Mid-level Encounter: Ideal for parties levels 3-8 as solo or small groups
Terrain Advantage: Use terrain to offset moderate combat abilities

Player Guide: Facing Cobbleswarm

2 strategies available

When your party encounters this creature, keep these strategies in mind:

Moderate Threat: Prepare standard combat tactics
Tactical Advantage: Use terrain and positioning

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 2.

Solo Encounter:

A single character of level 4 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 600 XP
Hard: 900 XP
Deadly: 1,200 XP

Based on D&D 5e Dungeon Master's Guide encounter building guidelines. CR roughly equals party level for medium encounters.

Frequently Asked Questions

What is the challenge rating of Cobbleswarm?: Cobbleswarm has a Challenge Rating of 2, making it appropriate for parties of level 2.0.
What type of creature is Cobbleswarm?: Cobbleswarm is a Medium Monstrosity, which affects how certain spells and abilities interact with it.