In response to the Hour of Ruin, the Mortisans of the Ossiarch Bonereapers have been hard at work concocting all sorts of morbid and magnificent new constructs with which to reap the tithe of bones, and help stem the Skaventide. Nagash has been thwarted by the servants of the Great Horned Rat at least twice – which is two times too many for the Supreme Lord of the Undead.