The Vistani
Travellers with wagons and firelight, camped at Tser Pool. They welcomed the party with food and wine in session 4, and Madam Eva read the cards there.

The reading said the Vistani have what the party seeks, and that a missing child holds the key to the treasure's release — Arabelle.
A second camp lies southwest of Vallaki: the Vallaki Vistani.