Granted Power: You can detect an active or inactive portal as if it were a normal secret door (Search DC 20).

Portal Domain Spells

1 Summon Monster I: Calls extraplanar creature to fight for you.
2 Analyze Portal: Find a nearby portal and discover its properties.
3 Dimensional Anchor: Bars extradimensional movement.
4 Dimension Door: Teleports you a short distance.
5 Teleport: Forces a creature to return to native plane.
6 Banishment: Banishes 2 HD/level of extraplanar creatures.
7 Etherealness: Travel to Ethereal Plane with companions.
8 Maze: Traps subject in extradimensional maze.
9 GateX: Connects two planes for travel or summoning.

Source: Spell Compendium

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