Also called a hyperspace link, it is an artificial connection and a theoretical source of infinite energy.
Due to the nature of higher dimensions, which have more abient energy than normal 3-Dimensional space, Hyperspace Links result in this excess energy bleeding down. The most common form this energy takes is often Engen, or Hyper Matter. However these links require constant maintenance as they are unstable.
When higher beings descend, they also bring with them their own natural links which unlike the artificial ones are completely stable.