Stone and Blood — Michael McClung

Anomus ip Garma, greatest living architect of the Subori Empire, is tasked by his emperor to construct a tomb for the emperor's concubine upon her death. Anomus and ten thousand workers labor in the desert for years while the emperor's dead love waits, ensorceled and undecaying, for her final resting place to be completed.
But betrayal awaits Anomus and all who slaved to build the Tomb, and a dark god has taken an interest in the evils man does to man...
Tomb: Stone and Blood is the first book in a new trilogy. It is a fantasy novel in the dungeon core genre, but it is not technically a LitRPG novel. (If you aren't sure what 'dungeon core' and 'LitRPG' are, don't stress - the book is a dark fantasy tale of revenge whose protagonist might surprise you. If you're a LitRPG fan, you should know that this story is all secondary world, no stats, but it is very much a dungeon core story.)