Mirror of Mental Prowess

This mirror resembles an ordinary looking glass 5 feet tall by 2 feet wide. The possessor who knows the proper commands can cause it to perform as follows:

• Read the thoughts of any creature reflected therein, as long as the owner is within 25 feet of the mirror, even if those thoughts are in an unknown language.
• Scry with it as if it were a crystal ball, able to view even into other planes if the viewer is sufficiently familiar with them.
• Use it as a portal to visit other places. The user first scries the place normally and then steps through the mirror to the place pictured. An invisible portal remains on the other side where she arrives, and she can return through that portal. Once she returns, the portal closes. The portal closes on its own after 24 hours (trapping the user if he is still in the other place), and the user can also close it with a command word. Creatures with Intelligence scores of 12 or greater might notice the portal just as they might notice a magical sensor or a scrying spell. Any creature who steps through the portal appears in front of the mirror.
• Once per week the mirror accurately answers one short question regarding a creature whose image is shown on its surface.

CL 18th; Craft Wondrous Item, detect thoughts, scrying, clairaudience/clairvoyance, gate, commune; Market Price: 175,000 gp; Weight: 40 lb.
Source: Dungeon Master's Guide v.3.5