They shifted the blame onto the Pharmacist.
Alright, all five people in the Ancient Tomb are modern individuals, and they probably don't have a proper understanding of the power wielded by ancient Supremes. Besides, they all assume that the Qilin Venerable is imprisoned in the tomb, making it impossible for him to reach the real world.
Thus, their courage grew significantly.
From the beginning, it was all about deception.
This is actually easy to understand. It's like those ancient Emperors, revered as the Supreme with authority over the entire world, yet they would stay confined in the Imperial Palace day after day, relying on ministers as their only window to the outside world.
Naturally, even they could be deceived.
Living is all about seeking profit.
As long as the stakes are high enough, they'd dare do anything—even if it means risking death.