Vibrations

'I feel like something is calling me,' he mused to himself. 

Reign couldn't quite explain it, but that was what he was feeling right now. 

He wanted to ask the system, but ever since he evolved into a demon lord, it had been unresponsive.

Deciding to trust his instincts, he entered the tunnel .

The walls of the passaged were lined with crystals, their gentle glow illuminating his path with a surreal green light.

As he walked deeper into the tunnel, his senses were in full alert when he suddenly felt a subtle vibration in the ground beneath his feet. 

It started as a faint tremor, barely noticeable , but soon grew stronger, causing loose stones to rattle and clatter.

Instinctively, he knelt down, placing his hand against the cold surface. He shut of his eyes, focusing on the vibrations traveling through the ground. 

Was it an earthquake, or something else entirely?