Grants the ability to fly, which is essential for reaching certain secret areas or navigating levels like "D'Sparil's Keep".
The most "useful piece" for this specific GOG release is to use a modern source port like . It updates the game to support high resolutions, widescreen, and modern control schemes (like vertical mouselook). How to set it up: Install the game from your GOG library . Heretic.Shadow.of.the.Serpent.Riders-GOG.rar
Run gzdoom.exe . It should automatically detect the HERETIC.WAD file and launch the game with modern features. Grants the ability to fly, which is essential
This "Shadow of the Serpent Riders" edition includes the original three episodes plus two additional high-difficulty campaigns: Grants the ability to fly
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