Heretic is a first-person shooter video game created by Raven Software, published by Id Software, and distributed by GT Interactive in 1994.
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.
The first sequel, HeXen, which also used the Doom engine, was released about a year after Heretic.
A second sequel, Heretic II, using a fully 3d engine, was published in 1998.
In early 1999, the source code of Heretic was published by Raven Software. This resulted in ports of Heretic to Linux and other operating systems, and updates to the Heretic engine which utilized 3d acceleration.
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