Money
Vilified as root of all evil and worshipped as ultimate goal, it is a powerful tool, which can - like fire - be used to create wealth or destruction. It is the lifeblood of any complex economy based on division of labor and as such the base for the prosperity we have achieved over the centuries. However this tool has been - like every other aspect of our lives - been hijacked by the Controllers and indeed become the main pillar of the control since the late middle ages, when core power shifted from warriors to bankers.