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Swarm, Gryllus

Large · Construct · CR 6 · Lawful Neutral

Source. Tome of Beasts 3

15 (natural armor)

110 (17d10+17)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

-2

WIS

CHA

Overview

Category Monsters

Size Large

Type Construct

Alignment Lawful Neutral

XP 2300

Initiative Bonus +4

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

Darkvision 60 ft (18.3 m)

Passive Perception 14

Skills

Perception +1

Languages

understands those of its creature but can't speak

Resistances & Immunities

Damage Resistances

bludgeoning, piercing, slashing

Damage Vulnerabilities

acid, fire

Condition Immunities

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

Traits

Book Bound

Hp max is reduced by 1 every min it is more than 60' from its book. When hp max reaches 0 dies. If its book is destroyed or moved to another plane of existence separate from swarm must make DC 11 Con save or be reduced to 10 hp. Swarm can bind itself to new book by spending a short rest in contact with the new book.

Construct Nature

Doesn’t require air food drink or sleep.

Immutable Form

Immune: form-altering spells/effects.

In the Margins

Can spend half its move to enter/exit its book. While inside its book it is indistinguishable from illustrations on a page.

Swarm

Can occupy another creature’s space and vice versa; can move through opening large enough for Tiny construct. Can’t regain hp or gain temp hp.

About Swarm, Gryllus

Swarm, Gryllus is a large construct with a Challenge Rating of 6. It has a lawful neutral alignment.

In combat, this creature maintains an Armor Class of 15 and possesses 110 hit points (derived from 17d10+17).

Swarm, Gryllus has communication capabilities including understands those of its creature but can't speak. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Swarm, Gryllus

2 tips available

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

Significant Threat: Challenging for parties of levels 5-10
Epic Potential: Consider legendary actions for memorable battles

Player Guide: Facing Swarm, Gryllus

2 strategies available

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

Significant Threat: Prepare spells and resources
Team Coordination: Coordinate attacks and defenses

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 6.

Solo Encounter:

A single character of level 9 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 4,200 XP
Hard: 6,300 XP
Deadly: 8,400 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 Swarm, Gryllus?: Swarm, Gryllus has a Challenge Rating of 6, making it appropriate for parties of level 6.0.
What type of creature is Swarm, Gryllus?: Swarm, Gryllus is a Large Construct, which affects how certain spells and abilities interact with it.
What languages does Swarm, Gryllus speak?: Swarm, Gryllus can communicate in understands those of its creature but can't speak.