Shades have the special ability of being able to control darkness with a substance called shadowvapor. This allows them to talk secretly, somewhat like transmitting to another person when their shadows cross. It is called shadow-whispering. A Shade's shadow carries their consciousness so only the receiver can hear the message. Shades can also take a reading of a person's potential for darkness. They can also disguise people so that they are hard (but not impossible) to see. This trick does not work close up.