The adventurers have delved into the Abyss to strike at the Demon Lord of Undeath, Orcus. On the layer of Thanatos, the Blood Lord has many outposts from which he spreads his corruption. One of his primary lieutenants is Doresain, the Ghoul King. If the PCs kill Doresain in his lair, they will strike a real blow against the foul demon lord. Pgs. 174-179

A deathpriest hierophant of Orcus has turned the lower catacombs of a cemetery into a base for the undead and demonic horde it is gathering. The deathpriest loses control, however, with the arrival of a balor, and its carefully orchestrated forays to snatch victims have turned into wholesale slaughters. The PCs arrive in a nearby town to meet with a merchant who promised to sell them a long-coveted magic item. They are not altogether pleased to arrive to find the aftermath of a brutal attack—and no sign of their item. Pgs. 150-155

The Raven Queen’s servants often seek out mighty allies. One of these is the black dragon Quetzallus, who resides in a deep cavern on the Shadowfell guarding a stream of souls flowing into the Raven Queen’s realm. But a death knight named Raxikarthus, betrayed by the Raven Queen in life, now seeks to enslave this dragon for his own purposes. He madly believes that he can stand against the Raven Queen, and seeks allies of all stripes—even her own servants—to do so. The death knight has found a pathway into the Shadowfell thought closed by mortals. Beneath a decayed keep, the undead dragonborn has reopened this portal and led his forces into the Shadowfell itself. The PCs are called in to beard the death knight in his lair. They find it abandoned, but discover a strange passage in the lower reaches. Pgs. 162-167