Sacrament is a Doom II episode replacement for limit-removing source ports with .ogg music support by Clan B0S. It features new graphics such as textures and weapon sprites, some new sounds and most notably the aforementioned custom mostly .ogg soundtrack. The plot follows a "Clan [B0S] fighter" as he wakes up from a nightmare into an apocalypse already in-progress. It is then gradually revealed that "the worthy" have already ascended to heaven, while everyone else have turned into bloodthirsty demons who are left to infight. He journeys into a now-desolate world, searching for answers as to what had happen, and why only he retained his humanity.