Inhuman Ascent: The Beast Within

Vortigern was once humanity's greatest soldier - a legendary mercenary captain who survived impossible battles across the galaxy. But after losing everything at the Battle of Klyros Prime, he became the subject of a forbidden experiment that would change his existence forever. Years later, he awakens inside an abandoned orbital laboratory, no longer fully human. His body has been transformed by alien nanotechnology, a mutagenic virus, and an ancient cosmic force known as the Soul-Eater - an entity that promises him unlimited power while slowly consuming his humanity.
Now stronger than any creature alive, Vortigern must discover what was done to him and why Dr. Nyra Korr created him. As he descends onto a dead planet filled with mutated monsters and forgotten civilizations, he begins building an army of creatures bound to his will. But the greatest battle is not against the monsters outside. It is against the beast inside him. With every victory, Vortigern becomes more powerful - and more dangerous.
As ancient forces awaken and dimensional portals begin to open across the universe, he must decide whether he will become humanity's greatest protector.or the monster that destroys everything.