This quest gives two free Signets of Capture. Malaquire will give you one at the start of the quest unless you already have one. Simply use it to cap any skill from any boss in any area. In general, the bosses in the northern Kryta area will have at least one skill that is taught by skill trainers further ahead. See Skills by capture location to find a boss who has a skill you want. After capturing the skill and returning to Malaquire, he will give you another signet for free.