This optional quest is offered to the Princess by Jacia in Hideout. Jacia will ask the Princess to steal a key from a guy called Vald, who can be found in Betancuria Arena. The Princess will be asked not to engage Vald and flee should he notice Princess's attempts to pickpocket him. This quest is pretty straightforward task, and once it is completed, Jacia will offer the Princess Kill Vald quest.