Heretic is a fantasy themed first-person shooter, where the player controls Corvus, a Sidhe elf. He is tasked with finding and defeating the evil Serpent Rider D'Sparil in the war-wrecked realm of Parthoris.
Raven Software released Heretic in 1994. It used a modified version of id Software's Doom engine. The game featured such enhancements as inventory management and the ability to look up and down. Ambient sound effects were used to improve the atmosphere of the game world.