The spiritual power of everyone around surged with a swoosh.
The good news is, although it's a dead end here, the rewards didn't shortchange anyone. They got the Quality Transformation Gem [Deep Gem], which currently has a high price outside, along with several large Souls, among other things. Aside from these practical items, the rooms in the Deep Church are filled with decorations that could be considered artworks. They look unique, and perhaps collectors would buy them if taken out.
This is why many adventurers want to take the land of Sain Dungeon with them; there are too many peculiar items here. Even items that don't appear as light points seem valuable to people. Look, someone is scooping the red candle from the candlestick.