The Road to Hell
The Blood War is an ancient conflict raging between the Fiends of the Lower Planes. The tanar’ri are the demonic forces of the Abyss, an evil plane of chaos. Representing the equally evil but lawful realm of Baator are the Baatezu, the dominant caste of devilkin. Neutral evil Yugoloths played both sides against the other. The Blood War had raged on since the Age Before Ages, a dark time when the Prime Material Plane had not fully developed. The conflict is massive, spanning entire planes of reality, and hosting an almost infinite number of fiends.