Otiluke's resilient sphere

When Otiluke's Resilient Sphere is cast, the result is a globe of shimmering force that encloses the subject creature if it fails to successfully save vs. Spells. The resilient sphere' will contain its subject for the duration of the spell. The sphere is completely immune to all damage; the only method of removing the sphere is by the use of a dispel magic spell. Hence, the creature caught inside the globe is completely safe from all attacks, but, at the same time, is completely unable to affect the outside world.