Book 6 is where it'll all go down. I am changing it completely. It'll be split into two parts. Part 1 set entirely in the Thrice Tenth Kingdom collecting Baba Yaga's life, death, fate and Power where Bellaluna (who has made several appearances so far) will be revealed to be Elena. Some of her followers will be here and help the PCs. The 2nd part will take place in a triumphant return to Whitethrone where Elvanna/Tashanna has finished her ritual and sits in the ice palace on her throne. The PCs will battle their way to her using their allies and battle Elvanna in her throne room. After the PCs kill Elvanna, Igwilv will use her power to create a rift to enter the throne room along with the torc of koshtitichie (the ritual being competed weakens Baba Yaga's spell enough to allow her to do this). Elena will appear and sacrifice herself to imbue the PCs with the mythic power needed to defeat Igwilv and the avatar of Koshtitichie. The fact that Tashanna has the torc makes book 3 make more sense too. The idea of the back story is to tie things together, allow for some fun reveals and make the last battle an epic multi part battle.