The Mountain Pass.
Li Jun found himself standing in the darkness of a cavern between two steep mountains. He stood atop a gigantic stone wall. Its surface was smooth to stop people from climbing, and it was thick enough that there was a spiraling staircase within it and it had small windows to shoot arrows through to defend against incoming attacks.
He looked down at the rotting mass of flesh and bones below the wall. The last barbarian attack was apparently months ago. Their bodies were left to rot as a warning to other tribes that got their hopes up about breaking through the mountain pass.
It was hard to tell a demonic cultivator from a regular one. There was nothing too distinct about them apart from the fact they gained their power by stealing it from other people rather than absorbing the spiritual energy from the world itself.