Osyluths (pronounced: /ˈsilʌθsOSS-ee-luths[4]), sometimes called bone devils, serve as taskmasters and interrogators of the devils. They act as law-enforcement throughout Hell, leading many devils to fear their presence. Bone devils delight in torturing mortals and devils alike, causing physical and mental suffering wherever they go. Osyluths, along with hamatulas, make up the bulk of the Servants of Mammon, Mammon's personal army.[5]

Physical descriptionEdit

Bone devils appear to be skeletal humanoids a tall, emaciated fiend with dried skin stretched so tight as to outline and emphasize every bone in its body. It has a skull-like head and a bony scorpion-like tail and exudes a stench of decay. An osyluth stands about 2.74m (9ft) tall and weighs roughly 227kg (500lbs). Osyluths often serve as the informers and police of the Nine Hells, monitoring and reporting on the activities of other devils.[3]


Pool of Twilight

The warrior Kern Desanea battling an osyluth, as depicted on the cover of the novel Pool of Twilight.

The famed Paladin Kern Desanea, the "Hammerseeker", fought with an osyluth during his adventures in the Moonsea region.[citation needed]




  1. 1.0 1.1 1.2 1.3 Wizards RPG Team (2014). Monster Manual 5th edition. (Wizards of the Coast), pp. 68, 71. ISBN 978-0786965614.
  2. Mike Mearls, Stephen Schubert, James Wyatt (June 2008). Monster Manual 4th edition. (Wizards of the Coast), p. 61. ISBN 978-0-7869-4852-9.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 Skip Williams, Jonathan Tweet, Monte Cook (July 2003). Monster Manual 3.5. (Wizards of the Coast), pp. 52–53. ISBN 0-7869-2893-X.
  4. J. Paul LaFountain (1991). Monstrous Compendium: Outer Planes Appendix. In Timothy B. Brown ed. (TSR, Inc.), p. 5. ISBN 1-56076-055-9.
  5. Monte Cook (Oct 2002). Book of Vile Darkness. (Wizards of the Coast), p. 150. ISBN 0-7869-0672-3.

Least: AdvespaLemureNupperibo
Lesser: AbishaiBarbazuHamatulaMalebrancheSpinagon
Greater: AmnizuCornugonErinyesGelugonOsyluthPit fiend
Miscellaneous Devils
Alu-fiendArchdevilCambionDuergarFimbrul devilHellcatHellwasp devilImpSeared devilSuccubusTar devil