Emergency Force Sphere

In reaction to immediate danger, you create a hemispherical dome of force of radius 5 feet that surrounds you and protects you from harm. The force cannot be destroyed by mundane means or dispel magic, instead requiring the use of disintegration.  The bottom edge of the dome forms a relatively watertight space if you are standing on a reasonably flat surface. Falling debris are deflected by the dome and if completely buried will arrange itself such that it will not collapse when the spell ends. The dome of force lasts for 1 minute after concentration is broken. You cannot cast a spell through the dome, or control any existing effects outside the dome from within it.