Escapades of the Dawn Wardens

The kingdom of Dusk fell to a sudden unexpected undead threat-- an army of undead warriors, displayign rare intelligence and led by a terrifying figure known as the Cursed Lord-- systematically destroyed the kingdom of Dusk. The Sun-king Erasmus fell in defense of his capital, Sunset. Most of the surviving population fled into surrounding nations as refugees. The Cursed Lord was defeated, unbeknownst to many, by a party of adventurers who halted his advance just before he was poised to strike over the mountains into neighbouring kingdoms. In the aftermath, the kingdom of Dusk remains occupied by a now leaderless army of undead.

Baron Lorenzo Tessario of Suncrest is killed while leading coalition forces against the undead. Rumours of foul play abound, and his succession is immediately called into question by his children, Allessandra (the eldest) and Marco (the male heir).

A party of high-level adventurers is contacted by the Riftwalkers, notably Lander and Lady Whisper, and asked to fly to Sunset, former capital of Dusk, and shut down three portals that have opened there, allowing fiends to pour forth into the material realm. They travel to Sunset, defeat many powerful foes and close three planar gateways, including one anchored in the Abyss itself.
At the third gateway, the party refuse a deal with the archdevil Hutijin, but in the process allow him access to a powerful soulstone. Only the intervention of a powerful celestial, Calisto, prevents catastrophe.