Canon merlin magic reveal fic
I'm trying to find this fic but I only remember it somewhat vaguely. I think Arthur and the Knights were trying to teach Merlin a lesson; leaving a letter on Arthurs desk to come and meet them. For some reason they were pretending to be a group of sorcerers threatening Arthur and/or Camelot and Merlin goes out to meet them. We get a nice BAMF Merlin reveal where the Knights find out about the magic and Merlin finds out the rogue sorcerers are actually the Knights.
Anyone have any ideas where I could find this?