For an outsider, titan, or Ancientbeast to be reborn, they would have to be at the eighth grade or higher.

For most eighth grade titans, outsiders, and Ancientbeasts, as long as they managed to secure their hearts, or prismatic crystals for the Phantasms, they could be reborn with the help of a ninth or tenth grade senior of their race.

Eighth grade ones still had to rely on their seniors to finish the process.

However, as long as ninth grade outsider grand patriarchs still ...