Iron Requiem

Publisher's blurb:

The winter winds howl over the Russian front, but the true terror is not the war—it is what lurks in the abandoned town of Volkov. Aegis intelligence has intercepted reports of strange disappearances among both Axis and Soviet forces, all linked to an underground bunker hidden beneath the ruins. The Shadum Collective is rumored to be conducting nightmarish experiments, twisting science and the occult to create something far worse than war. Your mission is to investigate, neutralize any threats, and ensure that whatever horrors the Shadum have unleashed never see the light of day. Alone in the frostbitten hellscape, you are the only thing standing between the world and an unspeakable atrocity.