Heretic: Shadow of the Serpent Riders Promo Art (DOS)
From the Steam store page.
Screenshots originally available at http://www.idsoftware.com/killer/heretic.html
Image originally available at: http://www.pi.net/game/msdos/schieten/heretic.html (page archived by the Wayback Machine). The same screenshot was featured at id Software website but in lower quality.
Screenshot preserved by a third party website but certainly official as it is similar to an image from id Software's site but in higher quality.