The Originals' Bloodline

The Mikalesons, the most powerful family on the planet; once led by Mikael Mikaelson until their mother Esther Mikaelson created the immortality spell after the death of young Henrik. Turning the all into vampires, creating the first hybrid, Klaus, and tripping Kol and Valentine from their magic. So they would never lose each other ever again. That price of that spell would forever change the world.