When you have time with a willing or helpless subject you can craft an ethereal tether with them. You perceive what they do and can discern realities about them or their surroundings, no matter the distance. Someone willingly tethered to you can communicate with you over the tether as if you were in the room with them.
The information on this site is based on the works of Sage LaTorra and Adam Koebel.
More information can be found at the Dungeon World Official Website.