Obsidian

is a material that comes from the Obsidian Shards....


 * The power of the Obsidian Cabal sprang from the shardstone that fell from the sky, and nowhere was it more concentrated and potent than here in Desolis.

Trivia

 * Obsidian seems to be fragments of the shattered moons caused by the Cataclysm, and not related to obsidian glass. It shares many properties with Blackrock in the Ultima series.
 * Obsidian may be named after the Obsidian Order, or vice versa.