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.

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.

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

 * 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.