The griffin kingdom has taken equestria and imprisoned Celestia and the main six. They failed to capture Luna and she fled to the north. She passes out from blood loss and wakes up somewhere strange.

Luna has been back in equestria for almost fifteen years and has adopted a modern speech pattern as well as gotten used to everything that has changed. Still she hides something, something terrible. She goes to the place this secret is kept to prevent its escape, Twilight and company follow her. They aren’t prepared for what they see.

Sex is only minor.

Luna has suffered much. How much would have killed any compassionate mortal. And it may just kill her. Her tears are countless, she may do the unthinkable. She formulates a plan and begins to carry it out. She looks through tomes of poisonous plants strong enough to kill immortals when another tome calls her attention. Reading it she finds another way.

King Sombra returns with vengeance. He banishes Luna to another equine world and wipes her memories too. Celestia, the mane six and spike go in after her, but there is a number of problems. One: not all of the locals are friendly. Two: Luna seems to be in a very serious predicament. Three: Spike is very VERY scary.