Gold

"...Is this the flag of the True Beginning Empire?" Robin asked suddenly as he pointed to a huge flag erected in front of the army and exclaimed. Seeing it made him ignore even the appearance of the army, which looked like a piece of patched clothing from above.

The flag had a completely black background, with a circular shape drawn on it, most of that circular figure was blue, and there were 6 scattered brown pieces in it. The borders of that circular shape radiated in golden color, and that circular figure was pierced through by a sword and a hammer.

Billy laughed proudly, "Haha, yeah this is our flag, What do you think? Great, huh? It was who recommended it."