Tahnarism is the ability to manipulate a portion of the Anti-Principle (the "force" present in Bukrai) to accomplish tasks. It is an attempt to introduce necromantic magic into Hârn that does not rely on the Morgathian Church and its pre-occupation with death.
Although Selvos is available from CGI, there is a significant amount of additional information available from the author. This expansion covers the people of the town and the surrounding land.