Percy Jackson: Blood of Olympus, Heart of the Wizarding World

Born to Sally Jackson, a brilliant witch of British descent, and the Greek god Poseidon, Percy Jackson was already a demigod of considerable power. What he didn't know, however, was that his magical heritage extended beyond the Greek Pantheon. Sally's lineage traced back to none other than Gellert Grindelwald, one of the most powerful dark wizards in history.

In this hidden corner of his ancestry, lay dormant a wellspring of magical abilities waiting to be awakened. Sally, aware of this heritage, trained Percy not just in the way of the demigods, but in the forgotten arts of wizardry. Aided by her vast knowledge, which she had honed at Hogwarts and later by studying her forefather's techniques, she equipped Percy with a unique amalgamation of magic.

Percy was taught the standard spells and enchantments from the wizarding world, alongside more complex and darker magics tied to his Grindelwald heritage. Sally was careful, however, to ground Percy in the morals that separated them from Grindelwald. She instilled in him the belief that power was not meant to dominate others, but to protect them.

With the wisdom of Athena, bravery of Gryffindor, cunning of Slytherin, and the sheer power of Grindelwald at his disposal, Percy's magic evolved into something truly unique. He developed his own brand of spellcasting, where ancient Greek words fused seamlessly with Latin incantations. His ability to manipulate water intertwined with magical prowess, resulting in never-before-seen spells that harnessed the fury of the seas.