Holden quickly ran over. "Mr. Zeller, what do you need me to do?"

Felix was still deep in thought, frowning. This was not just an adventure—it was something Francis had left for his descendants. Why would he make it difficult for them?

If the goal was to ensure the survival of his bloodline, there were a few methods they needed to try first. Forcing their way in might trigger some hidden trap Francis had set, putting even Felix in danger.

Despite his immense power, Felix knew better than to underestimate the most extraordinary alchemist of the Bronze Age, and caution was key.

Felix said, "Here's what we'll do. I'll make a small cut on your finger and let your blood drip onto the soil."

Though confused, Holden extended his hand. "Whatever you say, Mr. Zeller."

After the cut was made, blood dripped onto the ground. At first, Holden did not think much of it, but seconds later, his face paled as he watched the blood vanish without a trace. It was as if the soil had swallowed the b