Darius was pleased by the thoughtfulness of his two Branded Servants. It was true that he could likely achieve his task without the presence of a Queen Bug or even use his own Queen Bug as the mold, but having this would definitely make things smoother.
Darius then placed one of his fingers on the head of the bug in his hands and used one of his most nefarious Spirit element spell that he had personally designed, Soul Extraction. Immediately, an ethereal version of the Queen Bug was slowly pulled out from its head, the body it was coming from thrashing even greater as it screeched in primal agony, but it changed nothing.
Soon, the entire soul was dragged out, whereby Darius stored it in a special container for such existences. He then had his helpers, who were Guard Androids, prepare a set of equipment for him that he had long Transmuted for such purposes.