The Ossiarch Bonereapers are Nagash’s vision for the future of the Mortal Realms. Created from carefully-harvested souls and given bone-forged bodies, each is a new consciousness, specialised for conquest. Every Ossiarch Bonereaper has lifetimes of experience to draw upon and deadly martial might, used to great effect in the collection of the bone-tithe.
Ossiarch Bonereapers armies are tough. We mean really, really tough. Most of their units boast excellent saves, bolstered even further by their "Deathless Warriors" rule.