| Achievement Category | Lost Void |
| Description | In a single Battlefront Purge run, enter the Rest and Recuperation area 3 times and choose to obtain a Resonium each time. |
Refusing Medical Assistance
| Achievement Category | Lost Void |
| Description | In a single Battlefront Purge run, enter the Rest and Recuperation area 3 times and choose to obtain a Resonium each time. |
idk about Promeia synergy, but i plan to use her with Nangong Yu (or Vivian sometimes) and Yuzuha.