The Exo-Guardians' leader, Zigvigix, has been forced by recent events to revaluate the Society's arsenal of weapons. They order a new exploration mission to the irradiated nuclear wasteland world of Elytrio, homeworld of the beetle-like ghibrani species. Far from the homes of the surviving ghibranis, the PCs travel into a missile silo that contributed to the death of a world. What deadly weapons can the PCs find and what further concealed truths are there to uncover about the history of the ghibranis?
Content in Yesteryear's Sorrow is a continuation of the Starfinder Society scenario, Starfinder Society #1–03: Yesteryear"s Truth, however, playing this previous scenario is not required.