Rather than relying on these weak and useless Demon Kings, he might as well do it himself. Once his research into "Demon Kings" had gone deeper, he would only need to wait for his "elder sister," Silence, to bring back the vessel. He would extract the Demon King's power and soul contained within it, store them in a forged black crown, have Silence crowned as the Demon King, then seize her body. Then, he would touch the "door."
The one who knocked upon the door with a hammer would truly smash it open, kneel in worship as he entered that hall, and touch the origin of the Sarkaz bloodline.
To achieve this goal, Quetzalcoatl had been quietly awaiting the arrival of his "elder sister," Silence.
He had always tolerated Silence wandering outside with Nightingale, the vessel bearing the "Demon King's power," because the less Silence wanted Nightingale to know the truth, the more pain she would inflict upon the vessel. Every instance of pain needed to be covered with lies, and lies brought even more pain. Therefore, he knew that his "elder sister" would eventually return to his side with the cage.
Whether she intended to use the Absolutionists' secret arts to heal her or settle matters with him once and for all, she had to come back.
No one, no matter how much they despised their own bloodline or longed to break free from those shackles, could ever truly deny it. For it was meaningless to deny the Heavenly Principles that bestowed this blood-red gift.
At that moment, there was a knock at the door.
Quetzalcoatl propped up his hands and rested his chin upon them. He knew the blood relative he had been awaiting had arrived. With a sidelong glance, he gestured to Salus beside him. "Go welcome