Simply put, Arx Fatalis is an amazing immersive sim set in an post-apocalyptic underground fantasy setting. If you enjoy games like Thief and Deus Ex, you'll love this. Arx Fatalis is a true classic. Just make sure you install Arx Libertatis mod, it's 100% required if you want to have the best, optimal experience of this game. Just do it, it's free. Arx Liberatis (among many other things) fixes the magic casting system which was basically broken. From their FAQ: -Update the Arx Fatalis source code to support modern systems -Improve portability of the game -Provide ports and on-going support in source for modern systems -Eliminate bugs or limitations of the original -Improve basic functionality to bring the engine on-par with similar modern games -Provide for further improvements and customizations to be made to the game by the community If the game didn't have it's problems at launch (which have now been fixed) this game would have been regarded as one of the best RPGs of the 2000's.