The Hailong Kingdom of the Sands knew that the Death Altar lay beneath the yellow sands here. They also understood how to maintain the balance in this place, and had begun operating the Death Altar without destroying the immortal one.
All these signs showed that they had clearly come prepared.
How long had they been preparing?
Based on the calculations, they had been preparing for at least twenty thousand years.
The Hunting Realm opened once every ten thousand years. If the Hailong Kingdom of the Sands wanted to secretly carry out all these actions, they first had to enter the Hunting Realm and discover the Death Altar. Then they had to return and prepare the methods and materials needed to activate the altar, as well as study how to maintain the balance here.
In other words... during the previous Chu Emperor's Birthday Celebration, the Hailong Kingdom of the Sands had already discovered the Death Altar here. However, they had kept it hidden and quietly returned to study the Death Altar and the means of activating it.
This time, during the Chu Emperor's Birthday Celebration, they had made all their preparations and come fully prepared.
As for why the Chu Emperor did not know... when the Hailong Kingdom of the Sands discovered the Death Altar last time, the current Chu Emperor had only been the Crown Prince. Naturally, he could not have known so many secrets.
While Lin Bai and the Chu Emperor communicated secretly, the Crown Prince of the Hailong Kingdom of the Sands on the altar began to undergo strange changes.
"Wolf Marquis, what happened to him?" Chu Tinghan reminded Lin Bai.
Lin Bai immediately looked toward the altar. He saw the entire altar trembling violently, while the runes and Talisman Seals upon it burst into dazzling light.