Demigods at Hogwarts

When Primordial Chaos sires a son and a daughter, a dark and primordial force jumps at the opportunity to have both a power source(children with the blood of Chaos), and a vital card in a divine game of solitaire. Chaos turns to the Heroes of Olympus, the 7 to help him at a time of dire need. For this, they need to go to Hogwarts and ally with wizards.

13 year old twins Kayla and Ian have every idea what their father did when he sired them, and know that they are probably the most powerful demigods alive, if you can even call them demigods. So when Kayla is captured by enemy forces, and Chaos, the creator himself, cannot find his daughter, he turns to the only forces he knows can help him, the gods and their children. But when the defeated Death Eaters start to join in, Chaos knows this battle isn't for them alone, but for wizards that Hecate blessed. They join together to defeat what might be their most powerful enemy of all.