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