Create Portal

You cause a portion of a Crystal Sphere to become temporarily immaterial. A portal through the Crystal Sphere the size of a 100-foot radius sphere, allows the passage of creatures and/or a spelljammer through the otherwise impenetrable barrier. If the portal created by this spell is dispelled before passage is complete, any creature or spelljammer trapped within is crushed by the reformation of the Crystal Sphere.

This spell does not weaken the Crystal Sphere in any way.

At Higher Levels. When cast using a slot of 7th level or higher, the duration increases by 10 minutes for every other slot used above 5th.