Souriin's firebones is used to place minor fire-runes on a number of small objects. When the spell is cast, the objects to be enchanted must be placed in a line and must all fit within a 10'-diameter sphere. The fire-rune must be written onto each of the objects during a single casting of the spell. The casting time is one round per object enchanted.

If one of the objects is moved out of line after the spell has been cast, all of the enchanted objects explode with a fire similar to that evoked by a burning hands spell. The explosion does 1d4 points of damage for every three levels of the caster to anyone within one foot. The ink needed to trace the fire-rune is made from fireflies ground with fire-oil.

Campaign lore: Although it is not a necromantic spell, this spell was the first to be developed as part of Souriin's Deathwatch project.