This story is a sequel to The Broken and the Damned
A mysterious magic surge has been discovered just off the coast of Creui. Praetor Rainbow Dash is apart of the contingent sent to investigate, only to be caught in it.
At the same time, Luster Dawn has returned to Canterlot for her first Grand Galloping Gala since heading to Ponyville. While there, she demonstrates a spell that she found in the archive of the Princesses old castle.
Said spell may create a situation that neither is properly prepared for, nor even want. However, it may just be what they need...