The Vines by Steven Thorn
Underneath the metropolis of Aretania, a terrifying monstrosity wreaks havoc in the mines. Assigned by the Emperor to regain the underground complexes, Captain Duncan leads his soldiers into the mines to face the growing menace before it destroys the entire city.
Lost in the darkness, chased through a dangerous labyrinth, Duncan discovers the horror is more intelligent than they’d been led to believe. Suddenly, destroying the vines no longer seems possible, and escape has become inconceivable.