Thy Flesh Consumed is the fourth and final episode of The Ultimate Doom.

All of the level names, as well as the episode title, are phrases taken directly from the Bible (with the exception of the secret level "Fear"). The list was compiled by Kevin Cloud, and John Romero assigned names to the individual levels. This episode was also Tim Willits' first contribution to the Doom series, as he joined id Software after the release of the original Doom (version 1.666) and Doom II.

source: Doom Wiki