Terminus spent most of her time on Midgard preparing her Hive Fleet for its ascension. By now, the overwhelming majority of her larvae had hatched and grown. So much so that it was difficult to keep them a secret from the planetary population.
Because of this, Erich had commissioned Tia to create ships that would take the Naraku off world, so that they can go find another world to devour, and use its resources to create a proper Hive Fleet which was capable of withstanding the harsh reality of the galaxy.
In order to convince Terminus to agree to this request, which was one that her people thought was damn near unacceptable due to their almost religious hatred of mechanical technology. Erich had agreed to spend every waking hour of his life, over the course of the time it took to build this fleet, copulating with the young Hive Queen.