Daemon Bones

Daemon Bones (DB) are a reagent that is used in the Pagan art of Sorcery.

Pagan
Much like the human bone used by practitioners of Necromancy, daemon bone retains a sympathetic tie to the properties of the living creatures from which it is derived, lending it the strength to summon and bind daemons. Adding daemon bone to a Sorcery spell which does not require it will result in the accidental summoning of a daemon which will attempt to slay the caster for desecrating the bones of its kin, in addition to destroying the candles, reagents and focus already arranged for the spell.

Daemon bone naturally ranks amongst the rarer reagents in use on Pagan, as it requires the death of such potent beings for its harvest, although the Cabal under Malchir appears to have stockpiled a modest supply during the time of the Avatar's exile.

Britiannia
In the final years of the Age of Armageddon, daemon bones became known as one of the components of the Summon Pyros ritual - specifically in form of the skull of a daemon that not necessarily needed to be stripped of its flesh first. No special preparations are needed, just placing the skull inside a prepared pentagram is already enough for the ritual to work.

Ultima Online
In the Stygian Abyss expansion for Ultima Online, the Gargish magical school of Mysticism makes use of daemon bones as a reagent.

Trivia

 * Since in all games daemons dissolve upon death (explicitly stated in The Book of Lore) it is unclear how these bones are harvested.