Arthur started a spree of making his grand dragons. First he worked to create more originals. After all his previous attempts, it was easy for him to crush the vulgar power of the curtains and create three originals out of attempt.
In a day time, Arthur could summon up to a thousand originals. One of them would be sacrificed at the end of the day to leave behind the crystallized charcoaled corpse.
Then he would use his ability to turn it into a grand dragon.
He kept working like this for an entire three months or more. For a hundred day, he never stopped what he was doing and in the end he had a grand army of originals.
Now his originals were over one hundred thousand strong men. Such numbers made him very confident in his ability to crush any enemy no matter what.
Even that dark angel grandmaster, Arthur, wasn't worried about him anymore. Even if that mage was ready to deal with his originals, he wouldn't be able to handle such grand force.