The "Sacred One" that they had been referring to had been watching Lin Fan's group the entire time.
It had been trying to send messages to the goblins, trying to notify them that Lin Fan's group had already snuck into their camp and were about to make their way to the stairs, but it hadn't been able to connect with the goblins.
There weren't any goblins that had been posted at the temple where it normally contacted them from, so there was no one that received all the frantic messages.
When it finally saw Lin Fan's group heading down the stairs, it couldn't help shouting, "These useless goblins! What am I even keeping them for! I give them all that food and wine to keep them happy and they can't even do something as simple as guard the entrance to the third floor! How useless are they!"