Cabal of Obsidians
The Cabal of Obsidians were a collection of sorcerers who commanded the Obsidians. Using the magic of the Obsidian Shards, they used transformational magics on captive humans into Elves, Satyrs and Trolls. They also commanded the power to raise the Undead.
One such transformational magic facility is currently known: The Epitaph in Desolis.