This stalker of Vex'ahlia was following Vex and eventually paid the Clasp to retrieve her for him. Unbeknownst to the stalker, the Clasp had struck a deal with Vax'ildan, Vex's twin brother, to spare her life. Instead of the real Vex, the stalker was handed a child rapist turned into a copy of Vex.
The identity of the stalker has yet to be revealed on-stream, so it is unknown what was the stalker's name, race, or even whether the stalker was male or female. This article assumes that the stalker is male.