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I took out the items from my bag, I had prepared a large assortment of materials that I butchered out of the bodies of the demons. Before sending the Blue Oni head to the Duke, I cut off most of his hair, horns, fangs, and his two eyes, that's because those materials had a large quantity of demonic energy concentrated into them. I had also decided not to cut down his ears because that would make him way too unrecognizable.
Aside from that, I also had a lot of demon bones, which were obviously stronger than normal monster bones from here, and the bones of demons were of various colors, not just white, the Blue Oni's bones were actually black-colored, and the Imps often had red or orange bones.