The Dome of D'Sparil is the final episode of Heretic. After killing the Maulotaurs at The Portals of Chaos in Hell's Maw, Corvus enters a giant portal to an ancient castle at the bottom of the abyssal ocean, protected by gigantic crystal domes and inhabited by many monsters. This is D'Sparil's strongest fortress, for it is where he resides. Aside from D'Sparil and his Green Chaos Serpent, the only new monster introduced is the Ophidians.

Levels are themed to look like the interiors of opulent castles and temples. There are numerous water pools and canals running through all the domes.

Sky Color: Blue

Levels Edit

Heretic episodes
City of the Damned Hell's Maw The Dome of D'Sparil The Ossuary The Stagnant Demesne Fate's Path (deathmatch only levels)

• E3M1: The Storehouse
• E3M2: The Cesspool
• E3M3: The Confluence
• E3M4: The Azure Fortress (Exit to secret level)
• E3M5: The Ophidian Lair
• E3M6: The Halls of Fear
• E3M7: The Chasm
• E3M8: D'Sparil's Keep (D'Sparil is boss)
• E3M9: The Aquifer (Secret level)