Silver cord

The silver cord is a permanent link between the body and the spirit.

Description
It allows a person to swell for many years in one physical form. The silver cord is particularly important to dreamwalkers, who use the cord to leave their bodies temporarily. Key to the dreamwalker's ability is her flexible silver cord. It is so flexible that it allows her to walk through every zone of the dreamscape unharmed, and without causing lasting damage to her sanity. The silver cord wears down over the years, and once broken cannot be repaired.