Joining stone
From Tardis Wiki, the free Doctor Who reference
A joining stone was an artefact located on the Braxiatel Collection. It was housed in the Repository of the Improbable.
When Bernice Summerfield picked up the stone, it gave her a brief feeling of recognition that reminded her of Jason Kane, who was at that time trapped in another universe.
Benny took the stone to Goron IV, its original location. She was captured by the native Goronians, who used her as the sacrifice in their ritual to open a conduit to another universe. The joining stone amplified the energy of the ritual. briefly sending Benny along the conduit. The stone shattered after Benny was returned to her universe. (PROSE: The Door into Bedlam)
