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Sometimes the barrier isn't complete.
Enter the ''Astral Barrier.'' By building walls, doors and anything that needs to prevent a teleport or a walk on the astral plane with specific patterns, these can then be blessed by the local priest to form an ''astral barrier.'' Not only preventing teleportation through them, but also creating a barrier on the astral and shadow planes.
In rural areas where a wizard with teleportation or enemies that otherwise move beyond the mortal plane people may have forgotten why brick walls have certain pattern or the local spellcaster doesn't understand the purpose, there may be gaps in the barrier. These allow sufficiently high level casters to teleport through the barrier. Each such incomplete barrier has a fixed DC - established at the time the house was built.
