Family reunions. Just about every family has one every few years, even Celestia and Luna's family, even if, given the longevity of their family, its once every few hundred years or so. Today marks the first one Cadence, as Celestia's adopted niece, is there, with Twilight, being considered Celestia's daughter given how close the two are, there as well. This is also when the parents of the two are revealed to their fellow rulers, and it shocks the country. But this is not the only development. Deep in the depths of Tartarus, an enemy of the royal family and all life prepares to conquer the planet. Will the royal family be able to get over their differences and protect their home, or will they perish in the true fires of hell?