L'Ange du Chaos - Les Sources de Sang

This sourcebook is an epic campaign divided into four major acts.

The characters are sent to the Primary Plane, to the village of Mud-Earth in the heart of the Free Territories, to investigate mysterious events. 

What they discover leads them to the City of Clouds, on the trail of a mysterious trafficking operation involving crates containing the seeds of a smaugh tree, foreshadowing the invasion of this savage race on the world of the Planes. This hunt then leads them to the ruins of the Black City, the former capital of Darkness in the Free Territories, where they discover that the Smaughs have unlocked the secret of the magic that powers the Great Portals. They chase one of their sorcerers to the Wild Lands of the West. 

After a terrible battle in the ruins of an ancient fort from the Blood Wars, Chaos learns of the smaughs' plans, and Morion decides to intervene to help his former champion, Cellendhyll of Cortavar, in his final battle.