Download GZDoom and extract it into your game directory (often C:\GOG Games\Heretic Shadow of the Serpent Riders\base ).
Grants the ability to fly, which is essential for reaching certain secret areas or navigating levels like "D'Sparil's Keep". Heretic.Shadow.of.the.Serpent.Riders-GOG.rar
City of the Damned , Hell's Maw , and The Dome of D'Sparil . Expansion: The Ossuary and The Stagnant Demesne . Description Hero Corvus, an Sidhe Elf. Main Boss D'Sparil, one of the three Serpent Riders. Top Tier Weapon Phoenix Rod (Heretic's equivalent to the Rocket Launcher). Heretic: Shadow of the Serpent Riders Download GZDoom and extract it into your game