The Hero is ultimately coerced into assisting Ad Avis' Dark Master in collecting the Dark Rituals that will allow Avoozl the Dark One (an obvious Cthulhu pastiche, and most likely a reference to the Slavic deity Chernobog) to manifest in Mordavia's world.
The Hero is forced to aid Ad Avis' evil mastermind in gathering the Dark Rituals that will enable Avoozl, a clear homage to Cthulhu and likely inspired by the Slavic deity Chernobog, to manifest in Mordavia's world.