DM Overview: The campaign's central villain is Vesper Corvane, the self-styled 'Crown of Coincuts,' a former crime lieutenant who has unified Gravemoor's gangs through a combination of blackmail, ritual oaths, and unnervingly perfect intelligence. Vesper is not the true threat. The secret beneath Act I is that Vesper's impossible knowledge comes from a patron—a shadowy entity called the Undying Patron (the campaign's big bad evil guy, whose full nature is revealed in later subscriber acts).
Vesper's lieutenants whisper of 'the Quiet Partner' who never appears but always knows. In Act I, the characters recover a page of the Velvet Ledger, survive the syndicate's retaliation, and learn three things: the syndicate's enforcers bear a mark burned into their palms, Vesper answers to someone even he fears, and the ledger's pages are written in a cipher tied to something older than the city itself. Progression: Act I runs levels 1–3 and ends with the milestone 'The Ledger Page,' where the party holds the first tangible thread to the true villain.
Encounters use only SRD monsters (bandits, thugs, cultists, and similar street-level threats) plus Vesper himself, who appears only at a distance or through agents in this act—never in direct combat. Keep him untouchable, elegant, and always one step ahead.