Setting up a formation required a large amount of energy.
Normally, this energy came from spirit stones.
Therefore, setting up a large formation required a lot of high-quality spirit stones to be prepared in advance. Only then would the energy contained within be sufficient for the formation to operate.
However, Andrew did not prepare this in advance.
Therefore, he could only use the energy within his body to replace it.
However... the energy required for this formation was too much.
This was only what was needed to set up the formation. After the formation was activated, it would automatically draw energy from heaven and earth and operate on its own.
Very quickly, 70% of the energy in Andrew's body was extracted.
Only then did the formation started operating.
This Heaven and Earth Fire Separating Array was only recorded in the first book of the formation. It was a relatively ordinary formation.