Gregorovic was a fatally ill human of the Fourth Age, who was desperate to avoid death. In the hope of prolonging his life, he captured some Cywir elves and employed torturous experiments in order to find out the secret of their long lifespan. His work was unsuccessful, and he offered Sliske his soul in return for eternal life. He accepted Gregorovic's offer, but questioned whether Gregorovic had thought his proposal through. Sliske then summoned an abyssal demon called Erasinus, who proceed to eat Gregorovic's body and soul, take a monstrous new form resembling a macabre jester, and subsequently came to believe himself to be Gregorovic.
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