Sekarvu is a typical beholder. It spent much of its youth exploring underground realms and killing everything it found. One day, it came upon a large cavern filled with violet fungi. At the edge of the cavern, it found a small band of adventurers who had all but succumbed to the toxins of the fungi's tendrils. They offered little resistance to Sekarvu as it approached and began to feed on their still-writhing bodies. With its first bite, the beholder's life changed forever.

A long-simmering merchant conflict has turned into a war of assassination, and the PCs are called in to prevent an attempt to murder the daughter of one of the merchants. They lead her yuan-ti would-be killer on an overland chase through a canyon called Ehlonna’s Scar, which contains surprises of its own.