Question

Ren's group were led by Luke deeper into the Temple. The deeper they went the more confusing the hallways became. There were a lot of traps and secret doorways they needed to pass through before they were able to reach the hallway towards the Head Priest's room. 

The hallway to the room of the head priest was found underground. The hallway was lighted by torches and had a creepy vibe to them. As they were walking through the hallway Ren found something interesting. Since some time ago he was trying to sense the presence of the people in the Temple, but ever since they had gone underground his mana sensing no longer worked. 

'These walls block mana from going out, they are of the same quality as those found in dungeons that use a dragon heart. This place is like a rebirth of the ancient human civilization.'