D&D d20 system - I, Mordred The fall and rise of Camelot

D20 I, Mordred: The Fall and Rise of Camelot APL 0912 Source Book D&D RPG

In Ancient England, a tyrant king holds the land in the grip of fear. With the might of a magical sword and the threatened return of a long-dead sorcerer, this fiend holds the noble, the good, and the true in his sway, squelching the will of the people and denying the claim of the rightful heir to the throne. The villain's name is Arthur.

Return to a world you only think you know. I, MORDRED returns to the original legends of King Arthur as a mad dictator, clinging to power through use of his enforcers, the Knights of the Round Table. His son, Mordred, is the rightful heir and struggles to amass an army in the name of justice to usurp his father's throne. And in the background, Arthur's wicked half-sister, Morgan le Fey, schemes to control England's ultimate destiny. This is a land crumbling in decay, desperately in search of heroes.