Prismatic Globe (Abjuration)
Level: Mage 10, Sorcerer 10
Range: 10 feet
Casting Time: 3
Duration: 1 round/level
Area of Effect: 10-foot radius sphere
Saving Throw: special

This spell is identical to the 9th level spell Prismatic Sphere, but it moves with the caster. The sphere can pass through walls without harming them, but it won't move between areas.