In the middle of the Battle of Hogwarts, two unlikely men show up wanting to help Harry Potter and the Order. But who are these men? What are they hiding, and can Harry trust them? Also, what is Voldemort planning?

Arthur finds out about Merlin's magic and sentences him to death. In a last attempt to keep destiny from falling apart someone decides Arthur an his court should see what it was like for Merlin. AU obviously. But will Arthur understand? Set post season 4 cannon up to that point.