In the dark galaxy, the once powerful human beings have become slaves of many aliens until the arrival of a soul from another world.

When Emperor-class Titans and AT-AT Walkers fight at the same time

The Glorious Queen-class battleships and the Supremacy operate together

Astra Militarum and Stormtroopers advance in unison

The Primarchs fought alongside the Jedi Knights

These books have

This book Human Supremacy has no female protagonist

(Warhammer, Star Wars, Stellaris, Halo, etc.)

Note: The author is a P-game enthusiast