Main Page | See live article | Alphabetical index A heretic is a person guilty of heresy. Heretic is a first-person shooter video game created by Raven Software, published by Id Software, and distributed by GT Interactive in 1994. It uses a modified DOOM engine, which allows up- and down views. In 1999, Raven published the source code of Heretic. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.