Unite: Before it's Too Late

"'Guys!' He shouted, silencing the arguments and wiping a spec of blood of his distinct scar on his cheek with the back of his sleeve. 'We have to stop fighting and unite. Before it's too late. Meet me at the Rainbow Sprinkle Donut!'"
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Sophie Foster and her friends find themselves in unknown territory. Elysian has joined Lady Gisela. A mysterious prophecy rises. Now they must join forces with people of two species. Can they save the world and defeat the Neverseen once and for all?
Percy Jackson wasn't supposed to have any prophecies. Percy Jackson was supposed to be off to college. But, nooooooooooooooo. The Fates just had to stick him in yet another prophecy and it was sooooooo annoyingly vague. Not that the others he dealt with made a lot of sense, but what did it mean across realms?
Harry Potter thought the near fatal injuries and quests were finished. But after Ron-no shock there-opened a fortune cookie-total surprise here-that said the most absurd fortune ever and they were about to laugh when... it came true. Now he was on the run and mysteries and villains appear from the shadows and Harry, Hermione, and Ron have join Muggles that seem to have their own ways of defending themselves. But one thing doesn't make sense. Why are the dead rooming among the living?
Join the elves, demigods, witches/wizards on an adventure that mostly consists of near fatal injuries and trial. Will they succeed?
All characters belong to Shannon Messenger, J.K. Rowling, and Rick Riordan. The plot is mine.