The mountain has stood for a thousand years. It is about to crack.

Stonefast has endured for over a millennium - a vast dwarven city carved deep into the heart of a mountain. Its corridors stretch for miles. Its forges never cool. Its records are older than kingdoms.

And its stone has always held.

Until now.

When Senior Structural Warden Borin Stonewake discovers a fracture where none should exist, the numbers refuse to make sense. Pressure is rising from below - impossible according to every archive, every load model, every law of stone.

Engineer's apprentice Runa Ashmark finds columns failing under forces no one has calculated. Deepdelver captain Uldrik senses something moving beyond the sealed depths - behind doors that were never meant to open again.

As corridors buckle and the council hesitates, an unthinkable truth emerges:

The foundation of Stonefast was built on a mistake.

And the mountain is correcting it.

Under Deep Stone is a slow-burning epic fantasy of engineering, politics, and survival ? perfect for readers who love deep worldbuilding, layered tension, and multi-POV storytelling.

The stone does not forgive.