Travel to Plaguewood, northwest of Light's Hope. Destroy 8 Scourge Structures by using Smokey's Special Compound at the Mark of Detonation planted inside each building. Smokey has had the Ziggurats and Slaughterhouses marked.$B$BOnce you plant the bomb, leave the building and marvel at your handiwork.$B$BBy the way, Smokey's Special Compound is rather... unstable.