Raven Software's HeXen actually began development as an expansion for Heretic that was originally slated to hit the shelves as "Heretic II." However, the game design so expanded beyond the original game that this proposed the expansion of the Heretic universe took on a bold new identity of its own…HeXen: Beyond Heretic.
HeXen was developed over a period of 8 months, published by Id Software and distributed by GT Interactive in 1995. The game introduced the 3-D gaming world to the "hub system" of level progression, rotating polygonal brushes and multiple character classes that were available in both single player and multiplayer. All of this combined to help HeXen raise the bar for the first-person shooter genre. HeXen pushed Id Software's DooM engine to its absolute limits and surpassed Heretic as Raven Software's most popular, highly acclaimed title