Curse of D'Sparil is a 9-level episode released in January 2010, created by Kristus; with the secret level designed by his brother Karl.
Story-wise, the action takes place somewhere in between Corvus's victory against D'Sparil at the end of episode 3, and his eventual return to Silverspring in Heretic II. Still under the dying curse of the Serpent Rider, the Heretic is hunted by his foes even in his dreams, and cannot find his way back home. Perhaps there is a way to dispel the curse by confronting his enemies once more?
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