Witness

"At least it's a way for us to express our sincerity."

Finn Ernest laughed at himself.

Just then, Robertson Bartlett's had an extremely relaxed expression on his face. He shrugged and said, "Of course, that's not a problem. Finn invited you here, so you must be his teammate, right? Come and take a look too."

"Actually, to prevent outsiders from observing such rules, these are rules left behind by the vampire race a long time ago. It's nothing mysterious to us." 

"However, since we have decided that we will make some changes today, we will no longer guard this little thing. We will need your cooperation."

At this moment, Finn nodded in agreement. It was obvious that he agreed with what Robertson Bartlett had said. 

Hence, Robertson Bartlett led Chen Feng and the rest through the hidden church and deeper into the castle.

...

"Oh? So you guys hold the advancement ritual to improve their strength underground!"