 This is the source of their power and the anchor of the Web of Time itself, created by Rassilon and the co-founders of Time Lord society in the distant past.The Time Lords were accomplished stellar engineers and could control the development of stars with devices like the Hand of Omega, which was shown to be capable of forcing a star to go supernova.The Eye of Harmony exists within the Doctor's TARDIS as a collapsing star suspended in a permanent state of decay, hence harnessing the potential energy of a collapse that would never occur.<ref></ref> Whether these are all aspects of the Eye of Harmony on Gallifrey or individual stars in their own right is not made clear on screen.