What sort of spells might the Marauders put on the Marauder's Map? I'm writing a Marauder fifth year fic, and since it's got their nicknames based on their Animagus forms, it might have been created in this year.
I was thinking perhaps a form of that Homenum revelio spell as it reveals other people's presence, and maybe a Protean charm as well, but are there any other spells that could have been used on it?
I'm not sure if this goes here, or in the Plot-Potion forum. Feel free to move it, mods, if you think it belongs over there!