Residuum

4TH EDITION STATISTICS[1][2]
VALUE
Per unit 1 gp
Per 1 lb (0.45 kg) 5,000 gp
WEIGHT
0.0002 lb (0 kg) per unit.
Residuum was a magical substance that was left behind whenever a magic item was disenchanted.[3] Some described it as concentrated magic.[3][4]

Description
This substance was a silvery powder.[1][4]

Varieties
Abyssal Residuum
magical residue left behind by abyssal magic.[4]
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.[4]
Dark Residuum
the purified remnants of necromantic magic.[4]
Fartouched Residuum
a residue left behind by powerful Far Realm energies.[5]
Ostorian Residuum
concentrated magic left from the days of the Kingdom of Ostoria.[6]

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,[7] then fed that substance through white-hot tubes of melted glass before dripping it on to the mythallar.[8]

Usages
Residuum could be used as a generic material component substitute for any ritual.[3]

Trivia
Rust monsters retained residuum within their bodies after eating a magic item.[9]
Steel predators often had residuum in their bodies, as they delighted in eating items containing it.[10]

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