The Purple Fire Symbol
Arthur planned to bring the kids of the sky castle once the city's foundation was established. Also after solving the puzzle of casting the currency.
For him he knew it would be great to have more help. But as far as he could remember, anyone with good potential towards blacksmith was picked up by Agnus.
He watched her return with a large pile of papers, an ink and a brush. She started to work diligently over a table he summoned from his world.
He also asked Gege to inform Agnus about the part he would do later. He wanted him to be ready and make his men ready as well.
As for Deem and Gor, the two were now experienced in building cities. They didn't lack anything now but for the workers to dig deeply enough before laying out the foundation.
Arthur asked them to use nothing but the purple ore in that foundation. Despite the disagreement of Sara, the two complied with his wishes.