The Advent

The Advent is the name now given to the emergence of the Earth into the wider universe, bringing with it superpowers and magic.
  The event took place on January 1st 2000. At that time, Stonehenge exploded with power that no one had ever imagined, rocking the countryside and the world itself as the stars shifted and warped until the very heavens were rent asunder. Power flooded the world. Atlantis rose from beneath the ocean's surface and mermaids swam once more, while the top of Mount Olympus disappeared into the clouds. A handful of people took on new and fantastic forms, and ancient gateways to realms of myth and legend opened once more.
  To humanity's shock, they learned that for millennia Earth had been sealed away in a pocket universe where magic and superpowers were all but impossible to use, but with the Advent the seal had been broken.