Residuum

Residuum was a magical substance that was left behind whenever a magic item was disenchanted. Some described it as concentrated magic. It could often be found inside the bodies of creatures that fed upon magical items, such as rust monsters and steel predators.

Description
This substance was a silvery powder.

Varieties

 * Abyssal Residuum: magical residue left behind by abyssal magic.
 * Concentrated Residuum: a form of residuum that had been magically reduced to allow for a higher concentration. Some could be found in the Whispering Caverns.
 * Dark Residuum: the purified remnants of necromantic magic.
 * Fartouched Residuum: a residue left behind by powerful Far Realm energies.
 * Ostorian Residuum: concentrated magic left from the days of the Kingdom of Ostoria.

History
Following the Spellplague, a large number of shadovar sought to reconstruct the mythallar of Xinlenal. To achieve this they sought out magic items to disenchant for their residuum, then fed that substance through white-hot tubes of melted glass before dripping it on to the mythallar.

Usages
Residuum could be used as a generic material component substitute for any ritual.

Background

 * According to writer James Wyatt, the name residuum is taken from the Gilbert and Sullivan song The Soldiers Of Our Queen, which features the lyrics "Set them to simmer, and take off the scum / And a Heavy Dragoon is the residuum!".