Wrekker Knows that the rare and valuable metal gravium is essential for interplanetary journeys, as it allows to travel between planets with different gravities. He knew of a secret gravium lode and planned to destroy the other five mines with the help of aquatic creatures. To gain control of the galaxy he had no scruples to use meteor-strikes, explosions and human sacrifices Even the transfer of souls is employed to further his wicked his plans.