You can purchase the Thundering Mephis Phantom Echo for 300 Data Sets in the Simulation Training Point Shop . The listing for Thundering Mephis becomes available after you have accumulated a total of 2,500 Data Sets, which can be earned by clearing different difficulty levels in the Tactical HologrNow, when you are going to start building Yangyang’s echoes out, you’ll want one of the two options that will best fit each option you have for her. The first option is going to be for her hybrid build...