Revealed secrets

a fanfiction about a crossover between Merlin and PJO.
Camelot is in danger. An army of sorcerers and monsters is heading towards it to destroy it. Because nobody in camelot has dealed with this kind of monsters, who appear to be immune for their swords, before, Merlin decides to get help, help of the seven. But then Rachel makes an prophecy, wich sound very bad. Somebody is going to die. Tartarus has its own plans and there is more at stake than Camelot. The destiny of both worlds rest on their shoulders. And they have to deal with an situation wich is worse than every situation they have dealed with before.