Doom: SIGIL is an episode WAD for The Ultimate Doom released in 2019 by John Romero. The story of SIGIL continues from the fourth episode, in which Baphomet glitched the final teleporter with his hidden sigil whose eldritch power brings the player down to even darker shores of Hell. This WAD was named as a runner-up at the Doomworld's 2019 Cacowards.

Dimon12321 confronts the ultimate harbingers of Satan and becomes Earth’s savior as fast as possible using an Ultra-Violence difficulty, which is the most common skill level used in the Doom speedrunning and TAS community.