Prismatic Screen (Stronghold Augmentation)

Prismatic Screen: When creating this augmentation, choose one face of the wall. A prismatic wall covers the chosen side. It can be destroyed by the same laborious process as a prismatic wall; however, note that any layer destroyed automatically reforms 24 hours later.
The creator of the prismatic screen is immune to its effects. When creating this augmentation, the creator can add up to 1 additional person per caster level to the list of those who are immune to its effects.
Caster Level: 15th; Prerequisites: Craft Wondrous Item, prismatic wall; Market Price: 60,000 gp.