"What the hell… what happened here?" Jake thought. "Did someone drop a city-levering bomb here?"
Jake looked around for traces of that spiral tunnel, but he didn't find any. While the crater was only two hundred meters deep, and the hideout was a lot deeper than that, it was clear that everything below probably had been buried in the dirt. Jake considered who could have done that, and only the people involved would have reason to do so… perhaps the people of that world, but they didn't have the power for that.
Probably, the culprit was the guy who gave the leader of the liches all that technology and crystals… Jake could go around and ask the inhabitants of the region what they knew, but it would be a difficult task. He is human, and humans started those problems… he had to find some skill or item that would let him disguise himself against that kind of situation, or doing investigation work would be a pain.