Invisible Sun Rpg: The Key

Of the four hardcover rulebooks included in the Invisible Sun Black Cube, The Key is the title most referenced by every player around the table. A sort of players handbook for Invisible Sun, it contains the rules for creating and advancing characters, and many gaming groups prefer to have more than one copy at the table. This is that additional copy, released at the same time as the reprint of the highly sought-after Black Cube.