In Extremis is a series that combines literature, music, and artwork into narratives called Plot-Arcs along with standalone music, assorted lore, and over 150 articles in a wiki-like Knowledge Base.
There are two other chapters in the Rux aside from the first devoted to Extiru, one each for Suugch and Bauz, two of the first xiruens.
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A new Expedition has been announced. Much like the Rudimentary Expedition, we seek more expansive and generalized knowledge about the world around us.