When Harry got bitten by the Basilisk something happened inside his core even after the Phoenix tears healed him. After saving Ginny and getting to the hospital wing, he passed out. When he was sleep, he was visited in his sleep by none other than Salazar Slytherin informing him that he is his descendant. He informed Harry that all the Founders of Hogwarts put a fail safe in their bloodline if the world started to go dark and needed to be saved, the founders would somewhat merge with their Descendant. The Slytherin fail safe was unlocked if the descendant was bitten by a Basilisk, this would cause their descendant to be filled with the memory's of Salazar Slytherin, and their core would expand to be as big his was in his prime. Harry was informed from the memories he was getting from Salazar that not only was he not evil, but he was a Dark Wizard hunter before he met the other founders.

Harry now needs to discover who the other descendants are, and help unlock their bloodline to save the wizarding world from the dark.

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Harry- Salazar Slytherin Descendant (Probably should have snake familiar.)

Hermione- Ravenclaw, Hufflepuff, or Gryffindor Descendant.

Other two characters up to you, but it'd be nice to see it be from different houses, and characters unexpected. Although it's up to you if you decide to do this prompt.