Blade Barrier

The cleric employs this spell to set up a wall of circling, razor-sharp blades. 

These whirl and flash in endless movement around an immobile point. Any creature which attempts to pass through the blade barrier suffers 8-64 (8d8) hit points of damage in doing so. Note that creatures within the area of the barrier when it is invoked are entitled to a saving throw, and if this save is made, the blades are avoided and no damage is taken.

The barrier remains for 3 melee rounds for every level of experience of the cleric casting it. 

The barrier can cover any area from as small as 5-ft square to as large as 2" square, i.e. 20-ft x 20-ft under ground, 60-ft x 60-ft outdoors.

This spell is absolutely stationary. It does not move in any way except with respect to the circling of the blades around the fixed point of the spell center. The plane of rotation of the blades can be horizontal, vertical, or anything in between, however.