Silk definitely did not exist in the original WotBS. He's mostly the result of my tweaking the backstory to establish different power groups, since changing it to my setting removed one of the central figures of the story's history. Anyway, Silk is a mysterious eladrin youth searching for an ancient artefact, but mostly an excuse to exposit the existence of said artefact to the players.
War of the Burning Sky is a D&D campaign and setting available to ENWorld subscribers in 3.5 and 4e variants. It's not perfect, but it's defiitely the best and most ambitious adventure path I've worked with.