Description: Get Avernum 4, 5, and 6 fully registered on one CD for the Macintosh and Windows. Welcome to Avernum, Spiderweb Software's oldest and most popular series of fantasy adventures. The adventures tell the story of Avernum, a nation that lives in caves far under the surface of the world. Avernum started out as a prison, the final destination for petty criminals, misfits, and rebels. In these games, they struggle to form a nation, throw off the yoke of the cruel empire on the surface, and make a life in their dark, dangerous land.