Timed Stasis

This potent dweomer renders a single object completely impervious to all physical, magical, or scrying effects for a preset period. For the object, time itself comes to a complete stop, and it ceases to exist in the normal universe. Although the object can be handled, moved, or carried, no force known to mortals can breach its integrity, damage it, or pry it open.

The caster can choose to simply place the object in a continuing stasis that lasts for a specified time or until the spell's duration ends. He can also create a periodic stasis that is in effect only part of the time. For example, the wizard could protect a strongbox by creating a stasis that lasts from sunset to sunrise, or a fragile work of art from the rigors of a journey by designating a stasis of three weeks, or a trap door that was in stasis one minute in every three. Even the caster himself cannot disturb an object in limed stasis, although successful dispel magic spell cast when the stasis is not active is effective.

The material component is a small platinum spring worth at least 500 gp.