All credit for the names goes to this guy
Note: this book will take place following this timeline, not canon.

The stars will aid in her escape…

In an extraordinary world, Melissa Reading surpassed all expectations when she became the personal student of Queen Celeste. However, even on a planet with deities as protectors, there is still danger, and this comes in the form of a long-forgotten second sister, second queen.

Queen Luna was banished to the moon for treachery many centuries ago, but now the Tantabus that possessed her has gathered enough power to release her. As the only one who knows of this impending doom, Melissa disregards her mentor's assurances that she's deployed an agent she has the utmost faith in and takes matters into her own hands.

This can only end well.