In celebration of Arkane Studios’ 20th Anniversary, Bethesda is giving away their very first game, Arx Fatalis, for a limited time.

Arx Fatalis is a 2011 first-person fantasy game that takes place in a subterranean world. As a precursor to both Dishonored and Prey, Arx Fatalis uses open-ended gameplay that allows the player to use the environment to outwit enemies. The game was well-received despite low sales and eventually led to a partnership between Arkane and Valve with a Half-Life 2 spin-off project called Ravenholm, as detailed in the newest Noclip documentary about the history of Arkane Studios.

In subsequent years since the release of Arx Fatalis, Arkane Studios has come under the ownership of Bethesda and created the fan-favorite series Dishonored. To celebrate the companies history, Bethesda has created a new fan club for players that want to keep up with the latest on Arkane Studios, including their next game, Deathloop.

The mailing list, called Arkane Outsiders works a lot like DOOM’s Slayers Club and requires only a Bethesda account to sign up. Anyone that joins before the end of the month will be given a digital art book title  The Art of Arkane and Arx Fatalis, playable on the Bethesda Game Launcher.

To sign up for Arkane Outsiders visit Bethesda’s website.