Or it is revealed that the hero was in fact conceived by the lich in a vile magical experiment involving the blood of newborn children, jackal teeth & the eye of a Kraken, to create the ultimate Champion of Evil - but the experiment turned awry when the lich was distracted by a boob flash of one of his scantilly clad succubi and the infant was transported across the world in the barn of a random farming family who took up the child and raised it as their own.
So the hero would then finally learn of his heritage after facing and defeating one of the lich's powerful henchmen, who would splutter it out with his dying breath and leave the hero behind crying "Nooooooooooo!!!" in despair and cause a lot of tension with the hot cleric --- even causing the hot cleric to leave the hero's adventuring party only to be kidnapped by another henchman of the lich, forcing to hero to go and save the damsel in distress who would of course be locked in a tower with seventy-seven floors, each of them guarded by a Demon Prince and a three-headed hellhound.