Death of the Mane 6

A major threat has been made upon Equestria, the mane 6 and Princess Celestia aren't sure what threat has been made on Equestria. When they find out it was a distant country far ways from Equestria, the wonderbolts and the mane 6 are alerted by a letter to come to Canterlot at once, they race towards to the friendship express and all the way to Canterlot. But trouble is brewing………what will they know about this?