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Crystalline Devil

Medium · Fiend · CR 6 · Lawful Evil

Source. Tome of Beasts 1 (2023 Edition)

15 (natural armor)

102 (12d8 + 48)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

WIS

CHA

Overview

Category Monsters

Size Medium

Type Fiend

Alignment Lawful Evil

XP 2300

Initiative Bonus +1

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 120 ft (36.6 m)

Passive Perception 11

Saving Throws

Wisdom +4 Charisma +5

Skills

Deception +8 Insight +4 Stealth +7

Languages

Celestial, Common, Infernal, telepathy 120.0 ft (36.6 m).

Resistances & Immunities

Damage Immunities

fire, poison

Damage Resistances

acid, cold; bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons

Condition Immunities

poisoned

Traits

Devil’s Sight

Magical darkness doesn’t impede the crystalline devil’s darkvision.

False Appearance (Gemstone Form Only)

While the devil remains motionless, it is indistinguishable from an ordinary gemstone.

Glittering Temptation (Gemstone Form Only)

The devil sheds dim light in a 5-foot radius. Each creature that starts its turn within 30 feet of the devil and that can see it must succeed on a DC 15 Wisdom saving throw or be charmed for 1 minute. While charmed, a creature is incapacitated and must move on its turn toward the devil by the safest route, trying to get within 5 feet of the devil to hold it. The charmed creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. On a success, a creature is also immune to this devil’s Glittering Temptation for the next 24 hours. A creature charmed by the devil has disadvantage on the saving throw against Crystalline Spray.

Magic Resistance

The crystalline devil has advantage on saving throws against spells and other magical effects.

Actions

Crystalline Spray

Recharge 5–6

The crystalline devil sprays a burst of crystal shards. Each creature within 15 feet of the devil must make a DC 15 Dexterity saving throw, taking 27 (6d8) piercing damage on a failed save, or half as much damage on a successful one.

Multiattack

The devil makes three Claw attacks.

Shard Claw

+7 to hit, reach 5 ft (1.5 m). Hit: 2d8+4 slashing damage.

Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Bonus Actions

Betraying Carbuncle

The crystalline devil magically transforms into a Small or smaller gemstone or back into its true form, which is a Fiend. Its statistics, other than its size, are the same in each form, except it can't move or speak when in its gemstone form. Any equipment it is wearing or carrying transforms with it. It reverts to its true from if it dies.

Summon Devil

1/day

The crystalline devil magically calls one jewel-encrusted, fiendish animated armor that has the crystalline devil's damage resistances and immunities. The crystalline devil has a 25 percent chance of calling one crystalline devil instead. The called creature arrives in 1d4 rounds, acting as an ally of the devil and obeying its telepathic commands. The creature remains for 1 hour, until the devil dies, or until the devil dismisses it as a bonus action.

About Crystalline Devil

Crystalline Devil is a medium fiend with a Challenge Rating of 6. It has a lawful evil alignment.

In combat, this creature maintains an Armor Class of 15 and possesses 102 hit points (derived from 12d8 + 48).

Crystalline Devil has communication capabilities including Celestial, Common, Infernal, telepathy 120 ft.. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Crystalline Devil

1 tips available

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

Telepathic Communication: This creature can communicate telepathically, making it excellent for coordination with allies. Silence spells won't stop its communication. Consider 'Mind Blank' or abilities that block telepathy.

Player Guide: Facing Crystalline Devil

1 strategies available

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

Telepathy Awareness: This creature communicates telepathically! It can coordinate with allies silently. Silence won't stop it. Use 'Mind Blank' or abilities that block telepathy. Be cautious of mental attacks.

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 Crystalline Devil?: Crystalline Devil has a Challenge Rating of 6, making it appropriate for parties of level 6.0.
What type of creature is Crystalline Devil?: Crystalline Devil is a Medium Fiend, which affects how certain spells and abilities interact with it.
What languages does Crystalline Devil speak?: Crystalline Devil can communicate in Celestial, Common, Infernal, telepathy 120 ft..