Impure

When Castor, homeworld to the siblings Nero and Minerva, is destroyed by aliens, they decide to join the dreaded Impure, living weapons who are created by merging elite soldiers with god-like beings. When Minerva unexpectedly betrays her brother and all they ever believed in, it falls to Nero to stop his sister before she reaches the alien alliance. Can he stop her before what she stole can turn the tides of war and spell humanity's downfall?