The energy source for the Heavenly Observation Array is Mid-grade Primordial Stones.
There are four sets of the Heavenly Observation Array.
All four giant cities are equipped with them.
The cost of each set is as high as a million Mid-grade Primordial Stones.
Today, biofuel energy from Demon bodies, Primordial Stones, as well as the Five Elements Energy accumulated in arrays, are replacing mortal energy, becoming the core of technological transformation.
Human scientific research has never ceased. As early as the early days of the Great Catastrophe, Absolute Peak Experts had sent back war trophies from science-based worlds among the Three Thousand Worlds via the Candle Dragon Source Space, for scientists to study in the Human World.
