Adjusted Nys' background
a bit; he's still clearly a dominant and slaver, but I've softened him a bit to blend better into a largely Good group.
As the representative of a merchant family, Nys could have met nearly anyone during a transaction: either personal or while working with the military, clergy, or other organization, either as a middle man or to craft a magical item himself. He's also attracted to the powerful and unique, and may have come to know several of the group simply out of curiosity. Olivia is a great ice breaker, and may have dragged him astray to get a better look at something shiny or been caught trying to steal something. Finally, Nys isn't above mercenary work and may have met adventurers on shared missions or quests.
Chi: A few years past, Olivia was attacked by a hawk while delivering a message for Nys. She landed in Chi's grove, where she was healed and spent a couple days distracting the nymphs and girl, who were pleasantly surprised by her other forms. When Nys arrived to collect her he felt himself in the feys' debt; he has since sought to repay this by aiding Chi in her quest to legitimize her claim.
Aio: The Vendatti stand by their willingness to do business with anyone, and the Elan is no exception despite his strangeness. Nys has been serving as a middleman between Aio and the drow, seeking to find the one responsible for the loss of the telepath's children.
Alice and Torryx: Nys may know Alice and Torryx through his Clan's dealings with bondservants and slaves. As the two carried on with their divine questing they sometimes found themselves in awkward stewardship of orphans or captives not deserving of summary execution. The Vendatti promise a bright future for children and an attempt to rehabilitate the condemned.