The rules of the City of No Light have actually never changed. They were mentioned from the moment I first arrived here.
Unless the safehouse is completely sealed, with no light leaking out at all, once you open the shutter, you must turn off all light sources; otherwise, you will endlessly attract the attacks of the Unconscious Entities lurking here.
The strength of the Unconscious Entities is calculated based on their power in life, generally at least hundreds of times their power before death. Those who can come to the City of No Light tend to have power levels roughly equivalent to the defensive capabilities of the safehouse back in the day.
The Black Black Spirit Safehouse then was capable of defending against threats at the Heavenly Human Level.
So, the deaths of these two here are truly not surprising.
Yu Hong closed the shutter and glanced at Quan He, who also shook his head as he left.
"So this is the 'safety' that Senior Su Dan spoke of..."