Bone Devil (Osyluth)

Outsider (Baatezu, Evil, Lawful) · SM +1 Bone Devil (Osyluth) (Enraged Eggplant; answers SRD 3.5)

A tall, skeletal figure of bone plate and dry sinew, ember-eyed, with a long segmented tail ending in a sting. It is a jailer and an interrogator by temperament, deeply unpleasant to be near, and it works patiently to find the thing you will not give up.

Attributes

ST17

DX13

IQ11

HT12

HP17

Will12

Per12

FP12

Basic Speed6.25

Basic Move7

Dodge10

DR3

Melee attacks

Usage	Level	Damage	Reach
Sharp ClawsSharp Claws (16): thrust 1d+1 cutting, Reach C-1.	16	thrust 1d+1 cutting	C-1
Sharp TeethSharp Teeth (16): thrust 1d+1 cutting, Reach C.	16	thrust 1d+1 cutting	C
StingerStinger (16): thrust 2d-1 impaling + follow-up 1d-1 toxic (3 1-hour cycles; Resisted with HT-3; Symptoms – -3 to ST after losing 1/3 HP. -4 to ST after losing 2/3 HP), Reach C. Poison: Toxic Attack 1d-1 (Cyclic, 1 hour, 3 cycles, Resistible, +20%; Follow-Up, Stinger, +0%; Resistible, HT-3, -15%; Symptoms, 1/3 HP, -3 ST, +45%; Symptoms, 2/3 HP, -4 ST, +20%) Resolve as stated by the construction; the source gives no separate resolution text.	16	thrust 2d-1 impaling + follow-up 1d-1 toxic (3 1-hour cycles; Resisted with HT-3; Symptoms – -3 to ST after losing 1/3 HP. -4 to ST after losing 2/3 HP)	C
Fear AuraThe osyluth can take a Ready maneuver to project an aura of fear. Everyone within 10 yards of the osyluth must roll an immediate Fright Check (p. B360). If a victim succeeds at his Fright Check, he will be unaffected by this osyluth’s Fear Aura for one hour.	—	—	—

Traits (17)

• Appearance (Monstrous)
• Axiomatic Touch
• Combat Reflexes
• Dark Vision
• Doesn’t Eat or Drink
• Immunity to Noxious Fire Effects
• Immunity to Poison
• Magic Resistance 2 (Improved)
• Sadism (12)
• Skinny
• Social Stigma (Monster)
• Telesend (Magical; Universal)
• Temperature Tolerance 6
• Unaging
• Unholy Touch
• Vulnerability (Holy Weapons, x2)
• Vulnerability (Silver, x2)

Skills (4)

• 16Brawling
• 16Innate Attack (Gaze)
• 14Observation
• 14Thaumatology

Notes

• GCS ancestry draft: gcs/bone-devil-osyluth.gct
• Source template total: 459 points.
• Library-rebuilt template total: 459 points.
• CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
• Review attacks, special abilities, encounter frequency, treasure, grappling, and GCS modifiers before approval.

Encounter rating

CER47

Offense28

Protection19

Threat tierstandard

Appearing2

Wandering3

Tags

• srd-3-5
• outsider
• baatezu
• evil
• lawful
• devil
• fiend

GCS v5 downloads

• ↓ Character sheet (.gcs)Open directly in GCS
• ↓ Ancestry template (.gct)Apply to any character

Where this one came from

Source record

Bone Devil (Osyluth)

Source system

gurps_4e_fan_conversion / author_permission

Released under

cc_by_4_0

Conversion

0.2.0-reviewed

Review status

approved

Credit

Original GURPS conversion by Enraged Eggplant, from Monsters (May 11, 2024); adapted and republished with permission.

Description

Written by Dungeons on Automatic, released under cc_by_4_0

• GCS ancestry draft: gcs/bone-devil-osyluth.gct
• Source template total: 459 points.
• Library-rebuilt template total: 459 points.
• CER was computed from parsed Typical Stats using the Dungeons On Automatic baseline CER path.
• Issue #5: 2 special ability construction(s) restored (Fear Aura, Poison). 1 save-or-disable construction(s) are scored through the affliction term at the source's stated point cost, or at Binding ST where the source builds the ability as a Binding.
• CER recomputed from the reviewed Typical Stats through the canonical Dungeons on Automatic CER path: OR 28, PR 19, CER 47, threat tier standard.
• Conversion baseline reported OR 21, PR 19, CER 40 (tier standard). The reviewed values come from the consumer CER implementation, which rounds damage once after the damage-type multiplier and credits ranged accuracy; the conversion baseline ceilinged the damage base first and ignored range.
• Encounter metadata derived (default): average number appearing 2, wandering weight 3. Encounter metadata derived for 0.2.0 from the reviewed threat tier and creature class (appearing: minor 4 / standard 2 / major 1 / severe 1, forced to 1 for solitary classes — including swarms, which are a single multi-body creature — and raised to 6 for gregarious minor creatures; wandering weight: minor 4 / standard 3 / major 2 / severe 1). The fan-conversion source states no appearing-in-numbers or wandering values, so these are derived, not source mechanics.
• Lair, treasure, and grappling remain unpopulated in 0.2.0 by package policy: the authorized fan-conversion source states no lair, treasure, or grappling values, and review declines to invent them. See review/policy/0.2.0-empty-field-policy.md.
• Description text is original Dungeons on Automatic prose written from this record's own converted statistics and from the project's art direction for the creature. It is not derived from the authorized fan-conversion source, which states no creature descriptions, and not from any SRD. It carries its own authorship and CC BY 4.0 terms in the description field. See review/policy/description-policy.md.
• Review approved by automated-mechanical-review on 2026-07-26 (batch ee-2026-07-26-b4-special-mechanics); GCS fidelity check passed, DOA playability check passed.
• Special-mechanics record. Mechanics the CER path cannot price are named per record in review/reports/cer-audit.md rather than folded into the number, and encounter counts are capped where a save-or-disable attack is present.