It’s looks like a paradox to see the non-dual state of bliss as a tool to get vacuity. But it’s in fact a transcendental way to liberate the souls.  It’s not only a formal communion but the real creation of an alloy. We see in that sense that there is an evolution from the sacrifice with the sacred fire to the essence with the sacred light. This is also a way to see the importance of the role of gold. The fire and the light have its colour which is by the way also the colour of the halo. There is no more duality and the vacuity can be seen in essence and light which is the symbol of essential gold.