Portal Barricade

Underdark (Und)Forgotten Realms (3.5)
School
Transmutation
Casting Time
1 standard action
Components
V, S, DF
Range
Close (25 ft. + 5 ft./2 levels)
Target
One portal
Duration
1 hour/level (D)
Saving Throw
None
Spell Resistance
No

Related

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.