You should have acted. They're already here. The Elder Scrolls told of their return. Their defeat was merely delay until the time after Oblivion opened, when the sons of Skyrim would spill their own blood. But... there is one they fear. In their tongue he is Dovahkiin; Dragon Born!
That was a real dragon :O
These are scarier than dragons. Hell, the spheres are scarier than dragons.
I'd say the spheres are little bit behind the tough dragons...
<Blood Dragons
ancient dragons for the win