"A teleportation crystal. Destination unknown."
The teleportation crystal is a magic gem given to Geralt by Kalkstein as a means of teleporting from Places of Power back to the latter's house in the non-human district of the Temple Quarter. Kalkstein is almost completely sure that Geralt will indeed be teleported in his entirety, but there is a minuscule chance of something going wrong...
- A Mysterious Tower, indirectly