Capítulo 102: The Underground's Temple

Darkness completely enveloped the passages, Fein and others proceeded cautiously, they threaded the passage with vigilance as if ready to react when something goes wrong.

The four already knew the danger that they might encounter here after experiencing the sinisterness of grey moss. 

"Don't panic when something goes wrong... but be ready for the worst-case scenario. Venturing to ruins and strange places like this has a certain degree of risk." Fein reminded the others behind his back.

Sofia knew that Fein was knowledgeable about these things, so she doesn't have a say. She only found it strange that Fein manage to know all these things that only a few people would know.