Desperate Star Ocean? But I Have the Astartes Legion

Stranded in a dying galaxy where hope is a distant memory, she awakens with an impossible gift—an army of legendary Astartes warriors at her command. While civilizations crumble and alien horrors lurk in the void, one woman and her superhuman legion will rewrite the fate of the stars. In the darkest reaches of space, desperation meets divine intervention, and the galaxy will never be the same.