Manual of the Planes
The pages of this tome display complex diagrams of planar destinations and provide insight into the portals connecting various locations within the planes.
Wondrous Item 225,000 gp
You can use the Analyze Portal ritual as if you have the Ritual Caster feat and are of the appropriate level. The ritual’s component cost is halved, and it takes half the time to complete the ritual. You gain a +4 item bonus to Arcana checks to perform the ritual.
Power Daily (Standard Action)
Change the destination of an open portal to any other destination, as long as you know the sigil sequence of the new destination. The portal resets to its normal destination after 1 minute.
Published in Manual of the Planes, page(s) 158.