Arx Libertatis is an improved, cross-platform and open source engine for Arx Fatalis, a 2002 first-person role-playing game / dungeon crawler / immersive sim developed by Arkane Studios.

Arx Fatalis features crafting, melee and ranged combat, as well as a unique casting system where the player draws runes in real time to effect the desired spell.

Arx Libertatis updates and improves Arx Fatalis by supporting modern systems, porting the game to new systems, as well as eliminating bugs and limitations. In the future we plan to improve and modernize the engine as well as enable customizations and mods by the community.

Arx Libertatis is based on the publicly released Arx Fatalis source code and available under the GPL 3+ license. This does however not include the game data, so you need to obtain a copy of the original Arx Fatalis or its demo to play Arx Libertatis.