Guild Wars 2 is a massively multiplayer online role-playing game developed by ArenaNet and published by NCsoft. Set in the fantasy world of Tyria, the game follows the re-emergence of Destiny's Edge, a disbanded guild dedicated to fighting the Elder Dragons, a Lovecraftian species that has seized control of Tyria in the time since the original Guild Wars. The game takes place in a persistent world with a story that progresses in instanced environments. Guild Wars 2 uses a heavily modified version of the proprietary game engine developed for Guild Wars by ArenaNet. The modifications to the engine include real-time 3D environments, enhanced graphics and animations and the use of the Havok physics system. The developers say the engine now does justice to the game's critically acclaimed concept art, and that concept art will be integrated into the way the story is told to the player. The player is tasked with reuniting the members of the disbanded Destiny's Edge, a multi-racial adventuring guild whose members' struggles and eventual reunion serve as a microcosmic metaphor for the larger-scale unification of the playable races, whose combined strength is needed to effectively combat Zhaitan, the undead Elder Dragon. The game wa released on August 28th 2012.