The seven,nico,will,reyna,Sadie, calypso and the four  are going to New Orleans to help Hazel with something. After they find out that hazel's mother might had something that could help with the strange attacks that have been happening at the camps and at Manhattan house. But when they go there, they meet the michaelsons and a few others.
Thank you !!! To elizah121 for commenting and supporting my idea
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For Percy Jackson fans
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The vampire diaries fans and the originals fans too !!!