I orginally thought there was possibility of a King of Blades, but if you read the Tales of Albion it clearly states that William went in to the void and meet Jack sitting on a throne. Jack on a throne I would assume means he is the ruler of the void...
I would assume Lucian through his connection to Lady Grey through his connection to Mag(wife of Nostro) has gained some sort of knowledge of the first Sphire, but like most bad guys thinks that it will work for him. Maybe he knows of the missing piece (The Sword?), once again though just speculation.