The story of Forgotten Realms: Demon Stone revolves around the adventuring party's unwitting intrusion into an age-old conflict between two warring demonic armies; one led by a Githyanki Princess and, the other, a Slaad Lord. After inadvertently releasing both demons back upon the world after eons of imprisonment, it becomes the adventurer's quest to right their wrong and restore order to the world of Faerun.