Heroes of Paradis (An AOT x HoO Crossover)

Child of the forge once thought dead,
And daughter of Atlas fly ahead,
To a world that lies,
Beyond the gods' eyes.
Where the flags of the three walls fly.
A new type of Titan threatens to roam,
The land which the demigods call home.

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Leo Valdez and Calypso got lost on their way back to Camp Half Blood and ended up at Wall Rose where they meet up with the members of the Survey Corps.

Meanwhile back at camp the demigods receive a new prophecy that causes them to send Percy, Annabeth and Grover on another life-threatening quest.

(If you couldn't tell, I was really bored in math class)

Timeline:
Takes place after the Stohess District Raid and after Blood of Olympus but before ToA

Disclaimer:
I do not own Attack on Titan. That belongs to Hajime Isayama. I also don't own Percy Jackson or Heroes of Olympus. That belongs to Rick Riordan