Harry Potter and the World's End

Harry Potter knew that he was special, but he didn't know just how special he was. A Dark Lord chasing him, giant humans that like eating people invading eastern Europe, Gods and supernatural beings that are all over the place. Harry Potter/Attack on Titan/HighSchool DxD, elements from Percy Jackson crossover. Harry/Harem Smart!Harry Powerful!Harry MoD!Harry UnorthodoxMagic!Harry.