Young Heroes (remake)

7 young heroes from different worlds. All are brave, loyal, strong and each unique in their own way. Each of them have something to lose. They are brought together to fight something.
But is it for the good or for the bad? No one knows...

Percy Jackson, Harry Potter, Artemis Fowl, Clary Fray, Valkyrie Cain, James Adams and Callum Hunt are brought together by someone powerful but very mysterious...
They must fight to save those they love.

A crossover/fan-fiction of:
Percy Jackson, Harry Potter, Artemis Fowl, Shadowhunters, Skulduggery Pleasant, CHERUB & Magisterium.
Of course I don't own any of the main characters, the authors of their respective books are.

IMPORTANT:
The begin of the story belongs to wildeey. I've got the permission to rewrite Young Heroes and use the original idea.