Illusionary Wall

(Illusion/Phantasm)

This spell creates the illusion of a wall, floor, ceiling, or similar surface,
which is permanent until dispelled. It appears absolutely real when viewed
(even magically, as with the priest spell true seeing or its equivalent), but physical objects can pass through it without
difficulty. When the spell is used to hide pits, traps, or normal doors, normal
demihuman and magical detection abilities work normally, and touch or probing searches
reveal the true nature of the surface, though they do not cause the illusion
to disappear.

The material component is a rare dust that costs at least 400 gp and requires
four days to prepare.

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