The people of the Profound Sect witnessed the downfall of all the other Sect Masters and their disciples after the darkness had fallen into the world. Witnessing how each and every one of them goes insane as something on their skin turns black. Once their whole body turns black, including their pupils, their irises change to the shade of crimson.
Watching the whole transformation of ordinary people into monsters that live in the darkness terrified the people from the Profound Sect, especially seeing hundreds of these monsters banging on the barrier that protects the sect. They feared that the barrier would break and all of them would die under the claws of these strange monsters that used to be humans.