chapter 142 - "... Disgusting"
the room inside the Shrine was so dark, that without Taufik's Enhanced senses, it would be hard for him to see, it's not like there was no light in this room, There it was, but what made it dark was the Dense Corrupted Mana that accumulates in the room, it's so dense that even Light can got through.
That Corrupted Mana came from the "Pool" located in the middle of the room. Taufik called it "pool" Because it was shaped like an "onsen," Which he had always seen in some of the Anime he had watched.
Taufik would directly Jump inside that if it's Realy an "onsen." But what was inside that pool was not water but a black liquid that emitted a vile smell.
"... Damn! If it was a death Aura, I could make several Kl'lara with this"
Taufik commented, After seeing how dense the Corrupted Mana was in this room.