The Keepers

'And should the World Tree fall in your world, none from the Higherworld, none from the Underworld, will ever set foot again in the mortal realm. You will be stranded, and at the mercies of any who dwell in your world at that time. Beware, Keeper. Your world faces it’s direst fight this night.'

– Freya, Goddess of Love, Sex and War. The Keepers, Book 1.