C380 Sky-devouring dog

I made some gestures and sure enough, the keyhole matched the key in my hand. I immediately inserted the key in and gently twisted it, and a mechanical sound slowly rang out. The sound was very sharp, just like the sound produced when one's fingernails dug into the blackboard, giving one goosebumps.

The stone door was opened longitudinally, which meant that it was moving up and down