Portal Barricade

(Underdark, page 60, DnD 3.5)

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Transmutation

Level: ArrayPortal (Alternative) 5
Components: V, S
Casting Time: 1 standard action
Range: Close (25 ft + 5 ft./2 levels)
Target: One portal
Duration: 1 hour/level (D)
Saving Throw: None
Spell Resistance: No

Portal barricade temporarily closes a portal and prevents it from functioning for the duration of the spell.
Knock spells, chimes of opening, and similar effects cannot end or suppress a portal barricade, though dispel magic can negate it.