technology is the Eye of Harmony, a repurposed black hole singularity contained within the instrumentality below the Panopticon. 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. 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. Paradoxically, although the Time Lords are a scientifically and technologically advanced race, the civilisation is so old that key pieces of their technology have become shrouded in legend and myth. In the spin-off fiction, an edict and general aversion against exploring Gallifrey's past also contributes to this. Accordingly, until the Master rediscovers it, the Time Lords forgot that the location of the Eye of Harmony is beneath their capital. They also treated such ceremonial symbols as the Key and Sash of Rassilon as mere historical curiosities, being unaware of their true function. In the revived series, there were instances in which evil alien species have stolen Time Lord technology for their own purposes but such is its complexity that they are unable to operate it, as illustrated in "Doomsday" when the Genesis Ark was stolen by the Daleks and even they could not open it. Furthermore, the Genesis Ark was just one Time Lord prison that held millions of Daleks, demonstrating "bigger on the inside than it is on the outside" Time Lord technology. The classic series also makes reference to the inability of other races to successfully use Time Lord technology, with The Two Doctors stating that even if a race managed to copy and build their own TARDISes, they would be ripped apart by the molecular stresses of time travel as all TARDISes have a fail-deadly approach to unauthorised use unless primed with a Rassilon Imprimatur, creating a symbiotic link to a specific Time Lord. The great defence system of Gallifrey is a quantum forcefield known as the Transduction