War between the hell-sworn nation of Cheliax and its old enemy Andoran ripples across the Inner Sea. Yet Cheliax’s greatest foe might be its own long-oppressed people—including several heroes trapped there when Cheliax declares martial law and seals its borders. These heroes won’t just free themselves; they’ll unite the infernal empire’s worst enemies to defeat Cheliax on land, by sea, and even to the depths of Hell itself!