Harry Potter:Means to an End

Harry Potter saved his Godfather,Sirius Black from a fate worse than death.However no one anticipated the effects the Dementors had on his mind and magic.Will he become the Dark Lord's equal or will he lose everyone Powerful!Harry & Elemental Magic with The Mind Arts 4th year AU with Slowburn Harry Potter/Daphne Greengrass Dark not Evil!Harry Good!Dumbledore HG/RW/MW/GW Bashing