Bornath's Impossible Passage

The caster semi-permanently alters a passageway such as a bridge, doorway or stairway that they can see in one of the following ways:

• The passageway defies physics in ways that make it extremely inconvenient to traverse, such as bending and twisting in loop-de-loops, or inexplicably leading back to its own entrance, requiring skill checks (against the Caster's spell save DC) to traverse. The type of skill and number of checks are dependent on the type of obstacle and the length of the passageway.
• The passageway becomes animated and actively attempts to stop anyone from passing through, such as a door that changes which way it opens every time you try. It won't attack or deal damage, but will do everything it can to frustrate attempts to enter.
• The passageway collapses and is closed off 1d4 minutes after being entered.