Wardstone

The Bridgefort Wardstone is an enchanted token that grants its bearer and anyone with them the ability to use the teleportation circle that connects Bridgefort to Boareskyr Bridge. Prior to the Shining Crusade of Caelar Argent, it was stolen from Bridgefort by a cultist of Cyric from the nearby Ruined Temple of Bhaal. When encountered at Troll Claw Woods, Jaheira will instruct Gorion's Ward to seek out the Wardstone and use it to enter Bridgefort.

Location
The Bridgefort Wardstone is in the possession of High Priestess Akanna in the Ruined Temple of Bhaal, and can be looted from her body after she is killed.