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Using a modified DOOM engine, Heretic introduced the inventory manipulation feature on the FPS genre, while enabling an up and down viewing system as well.
Heretic also introduced multiple gib objects spawned when a character suffered a death by extreme force or heat. Previously, the character simply crumpled into a heap of jumbled body parts.
A sequel, Heretic II, was published in 1998.
In 1999, the source code of Heretic was published by Raven Software.