Argorok

A beast possibly older then the Twili's ancestors, it is unknown if Argorok is native to the Realm of Twilight or was banished from Hyrule with other dragons, such as Onox. Regardless, Argorok naturally serves no one, not even the Twili. In recent times, however, word has spread that a way into Hyrule has opened, and Argorok (unsurprisingly) has submitted his services to Zant in exchange for access to Hyrule.