Tolong jelaskan mengenai Gensou siblings dari Daftar karakter The Familiar of Zero

The Gallia Knights, also known as the Elemental Siblings, are mercenaries that first appear in the fourth season. King Joseph had them steal the Founder's Round Mirror and hand it over to him. They consist of:  ,  ,  , and  . Bleu and Jeanette are happy fighting with Saito and capturing Louise. Jack summons golems similar to Guiche's Valkyries. Once they'd fought with them at De Ornielle, but Damiem put a stop to it since it's not actually worth any money. Tabitha hires their help in the battle with the Ancient Dragon at the school after she became the queen of Gallia.