Hammer of Hephaestus (Leo Valdez fanfic)

My Life as Percy Jackson's Twin Sister

What if Percy Jackson had a twin sister? One who only knew about him after the Battle with Kronos and met him a week after their birthday? Would she change The new Great Prophecy? Or would there be a different one? Read to find out! PS: Yes, the Great Prophecy will be changed, but just a little! This story is really b...