Tales of the Oremian Empire
These low-laying mountains appear to be solid black due to their high obsidian content. Some parts in the interior part of the range are nothing but large shards of obsidian, and is a very treacherous place to travel. They form the northeastern border of Risia and the western border of Kurasyl.
Although technically claimed to be part of Risia, few enter the Obsidian Mountains due to their danger and the near nonexistent need of obsidian.