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Book 1

After the giant war, there are a lot of monsters that need to be sent back to Tartarus.
But it's hard to fight when the rest of the world thinks you're the bad guy

Camp Half Blood and Camp Jupiter meet the Avengers

This takes place is the space between the Giant war ending and the Trials or Apollo starting and after Age of Ultron ( I know those dates dont actually line up but just pretend that they do)

I do not own any of these characters