As we were going deeper and deeper into this place over the course of 4 days none of us slept, which is not a problem as we are mostly Vampires, Ivan being an Undead doesn't need sleep, Hela says he could go a month without sleep easily and the person I thought would have the most sleep problems Érica says she's already gone a week without sleep with her magical research (Evil).
Lilian had already warned us that it would be dangerous to sleep in this place as she has enemies that can possess our bodies or affect our minds when our guard is lower.
I don't know if any of them could affect someone with my level of strength, but I don't need to test my luck to find out.
During these few days, I noticed how much stronger everyone has become after thousands of fighting day and night, enemies can be weak below Grade S mostly, but some Grade S enemies have already started to appear.
