A 250-meter-tall version of Gravis escaped out of the fallen Life Ring. This had been a gamble because if the Emperor's attack had been a wide-range attack, the Life Ring might have gotten destroyed along with Gravis' weaker body. Fortunately, Gravis had judged the personality of the Emperor correctly.
What exactly had happened? How was Gravis a level four King suddenly?
When the Emperor appeared, Gravis told the Commander that he would confiscate all the corpses and consume them to become a level four King. If the Emperor were a traitor, Gravis would fight him and buy time for the defensive line to retreat. If the Emperor weren't a traitor, Gravis would pay the corpses back in the future.