And, even if you managed to do all of that, how would you sustain large populations of people without food and water? Small communities worked, but on a larger scale, anyone familiar with such matters knew it was a foolhardy attempt.
However, Dyon was different.
Firstly, he didn't plan to use the underground workings for something as simple as sneak attacks. He instead planned to use them as anchors for his fortress.
The Mellow Tribe was special in that a large Energy Surge of the past created numerous underground workings beneath their tribe. But, while they saw escape routes, Dyon saw dozens holes to be exploited.
With a wave of his hand, Dyon formed large structures that dug into these holes. Walls soaring dozens of meters seemed to appear out of nowhere, causing those of the Mellow Tribe to tremble, their eyes shining with thoughts of worship.