Draziri

Draziri belong to a martial theocracy. Their religion is based on admission to afterlife after a lifetime of service and piety, and they believe that a Draziri who kills a Hiru is guaranteed a place. The Protopriest of Draziri proclaimed the Hiru to be an abomination.

The Draziri only discovered interstellar travel a century ago, after which they spent fifty years preparing to invade Hiru homeworld. When they finally did, they detonated a device that killed millions. They spent the next fifty years hunting the surviving Hiru.