Break out the party poppers – Prey and Dishonored developers Arkane Studios turns 20 years old this year. Well, sort of. The studio may have been founded in ’99, but who am I to ruin a party? To celebrate two decades of sneaking, stabbing, and all-round immersive sim’ing, Arkane are dusting off the oldest book on their shelf by giving away free copies of the studio’s 2002 fantasy debut Arx Fatalis.