- For information on the level "Hell's Maw", please see E1M8: Hell's Maw.
Hell's Maw is the second episode of Heretic. After destroying the iron liches in the City of the Damned, Corvus enters a lava cave where he discovers a portal into another dimension. Passing through, he finds himself in a hellish world. It is a staging ground for D'Sparil's minions, inhabited by even more evil creatures, such as the weredragons and sabreclaws, and new weapons such as the Hellstaff, Phoenix Rod and Firemace.
Level themes include lava, fire and ice, with some levels using a combination of them. There are numerous cavern- or temple-like areas. Of the three original episodes, Hell's Maw has the highest amount of damaging floors. The intermission screen depicts the gameplay of the episode akin to travelling on a side of a volcano, with the opening level on the top and the boss one at the bottom.
Hell's Maw uses a red skyline, being unique to the episode. As in Doom, the fifth level reuses music from the game's first episode. However, the remaining eight levels of Hell's Maw have unheard songs.