The Primary Color headquarters was situated in a mountain valley of the Nairlean Empire.
As the Lord of the Void had described, Primary Color was a vast organization, and there were still three branch bases on islands at sea. Some Derivatives had been distributed across those islands to prevent them from being wiped out all at once. It also prevented chaos if something went out of control.
Their headquarters was well defended, as almost all of the top ten Derivatives were here.
Furthermore, there was a team of Terminators on standby at all times.
After introducing Primary Color's situation, the Lord of the Void looked at Arthur and cackled. "It would have been troublesome to sneak in, but an opportunity has presented itself!