Balthazar’s Zone of Temporal Displacement

Your understanding of time allows you to ward a limited area against the ravages of natural entropy.

The warded zone can be a square or rectangle up to 20 ft. on a side and up to 20 ft. high, or a 30 ft. radius sphere. All objects within the zone, including walls, are completely immune to the effects of time so long as the spell holds. A corpse within the area is likewise preserved, and cannot become undead, as if it were under the effects of a gentle repose spell.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, you can extend the area of effect by 10 ft. in any direction if the area is a rectangle, or by 5 ft. in all directions if it is a sphere.