The Frozen City
The Vai is a an assassins’ guild in Ptolus. A contract with them is said to be outrageously expensive and their targets tend to be the famous and infamous within the city. Wearing masks anytime they’re acting in their role ass killers they’ve hidden the size of their guild extraordinarily well, it could be as few as two or as many as a thousand strong. They are tied to almost every evil organization in the city in some way.