Bone Devil

Bookmark (0)

No account yet? Register

Welcome to the A.T.L.A.S. database entry for the Bone Devil, a fearsome creature hailing from the realms of Dungeons and Dragons 5e. Bone Devils, also known as Osyluths, are demonic entities with a skeletal appearance and a relentless thirst for pain and suffering. Their formidable abilities and merciless nature make them a significant concern for our organization.


With their skeletal frames and imposing presence, Bone Devils strike a terrifying image. These diabolical beings stand tall, draped in tattered flesh and wielding wicked weapons. Their skeletal wings allow them to take to the skies, granting them aerial superiority and swift maneuverability. Bone Devils emanate an aura of malice, evoking fear in those who dare to face them.


The Bone Devil possesses a variety of formidable abilities. Their exceptional strength can unleash devastating physical assaults upon their adversaries. Their innate magical abilities allow them to cast spells, such as summoning darkness or paralyzing opponents. Additionally, Bone Devils possess a potent stinger that delivers a venomous strike capable of inflicting severe harm or even paralyzing their victims.

Threat Level Analysis: 

Bone Devils are considered a highly dangerous threat, given their sinister nature and potent capabilities. Their challenge rating (CR) reflects their deadly potential in combat. Engaging in direct confrontation with Bone Devils is ill-advised, as their strength and magical abilities can quickly overpower even experienced adventurers. Their ability to paralyze opponents and manipulate darkness gives them a strategic advantage. Extreme caution, meticulous planning, and sufficient preparation are necessary when dealing with these malevolent entities.

Analysis conducted by A.T.L.A.S. – Research Division

Bone Devil’s Stat Block

Large fiend, lawful evil

Armor Class 19

Hit Points 142 (15d10+60)

Speed Walk 40ft. Fly 40ft.

STR 18 (+ 4)

DEX 16 (+ 3)

CON 18 (+ 4)

INT 13 (+ 1)

WIS 14 (+ 2)

CHA 16 (+ 3)

Saving Throws Str + 4, Dex + 3, Con + 4, Int + 5, Wis + 6, Cha + 7

Skills Deception +7, Insight +6,

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

Damage Immunities fire, poison

Senses darkvision 120 ft., passive Perception 9

Languages Infernal, telepathy 120 ft.

Challenge 12 (8,400 XP)

Devil’s Sight. Magical darkness doesn’t impede the devil’s darkvision.

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


Multiattack. The devil makes three attacks: two with its claws and one with its sting.

Claw. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 8 (1d8 + 4) slashing damage.

Sting. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 17 (5d6) poison damage, and the target must succeed on a DC 14 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Characteristics of the Bone Devil:

Bone devils, or osyluths, hold a powerful position among the baatezu devils of the Nine Hells. Tall and gaunt, these skeletal creatures fear the hearts of mortals and devils alike. Their sickly skin tightly stretches over their bones, and their menacing skull-like heads emit a putrid stench of decay. With scorpion-like tails and a physical presence that exudes malice, bone devils embody negative emotions such as lust, jealousy, hatred, and fury. They take pleasure in the suffering of others, instilling fear and dread in their victims.

Behavior and Abilities:

Osyluths are patient and cunning, adhering strictly to the principles of baatezu morality and carrying out the will of their masters. In combat, they project an aura of fear, causing their enemies to panic and flee. These fearsome creatures possess a range of magical abilities, including flight, invisibility, illusion-crafting, and the creation of ice walls. Combining their violent attacks with tooth and claw with the paralyzing effects of their tail venom, bone devils effectively subdue and incapacitate their adversaries.

Environment and Role:

Bone devils serve as the moral police force within the Nine Hells, vigilantly monitoring the activities of other devils and ensuring adherence to the tenets of law and evil. Congregating primarily in Stygia, one of the lower circles of Hell, they play a significant role as personal servants to Mammon. While despised and feared by their higher-ranking counterparts, osyluths possess the authority to punish devils who violate the laws of Baator, condemning them to the Pit of Flame or transforming them into lemures.

Within their society, osyluths participate in promotions and wield influence in the decision-making process for the advancement of gelugons to pit fiends. They excel in both arcane and divine magic, specializing in the art of divination and serving as priests. Thriving in cold environments, bone devils possess the extraordinary ability to see in total darkness and the ultraviolet spectrum, granting them an advantage in their infernal pursuits.

Strategies for Confronting the Bone Devil:

When facing a bone devil, careful planning and strategic execution are paramount. Consider the following strategies to increase your chances of success:

  1. Psychological Resilience: Bone devils instill fear and panic in their enemies. Developing psychological resilience and maintaining a calm demeanor is crucial when confronting these creatures. Mental fortitude and strong willpower will aid in resisting their aura of fear.
  2. Exploit Vulnerabilities: Bone devils possess physical weaknesses that can be exploited. Targeting their skeletal structure can impair their mobility and weaken their attacks. Employing spells or weapons with anti-undead properties can also prove effective against these skeletal adversaries.
  3. Disruptive Magic: As formidable spellcasters, bone devils rely on their magical abilities to gain the upper hand. Disrupting their concentration or employing spells that counter illusions and invisibility can level the playing field and reduce their advantage.
  4. Coordinate Attacks: Engaging bone devils as a well-coordinated team can tip the scales in your favor. Utilize ranged attacks to keep them at a distance while melee combatants close in, exploiting opportunities to strike when they are vulnerable.

Case Study: Exorcists case conducted by A.T.L.A.S.

In a recent encounter documented by A.T.L.A.S., a team of skilled operatives known as the Exorcists faced a bone devil within the infernal depths of Stygia. Equipped with enchanted weapons that could disrupt the devil’s skeletal structure, the Exorcists unleashed a coordinated assault. A seasoned spellcaster neutralized the osyluth’s magical defenses, while the team’s rogue delivered precise strikes to exploit its vulnerabilities. Through their combined efforts, they successfully vanquished the bone devil, ensuring the safety of the nearby villages.


Armed with the knowledge garnered from the A.T.L.A.S. database, you now possess a comprehensive understanding of the bone devil, its distinct characteristics, behaviors, and preferred environment. Furthermore, you have been equipped with effective strategies to confront these fearsome creatures. s.


The Bone Devil is a DnD 5e Creature from the Monster Manual of Dungeons and Dragons

  1. Here is the source of the artwork for the Bone Devil
  2. Here you can find more pieces of information about the Bone Devil in DnD 5e

Leave a Reply

Arkane Atlas 5e Online Archive

Handcrafted by and for Gamers © Arkane Atlas di Pietro Cavagnoli 2023  •  All related content, characters, names and materials that could be part of an existing work, are the exclusive property of their authors.