The mana of the second wave of cultivators was depleted, followed closely by the third wave.
When the mana of the third wave of cultivators was also depleted, the first wave had almost recovered, nearly perpetual motion.
The remaining cultivators were responsible for facing the enemy head-on.
A formation consists of two parts: the formation itself and the energy supply system composed of spirit stones and cultivators.
The rotation of cultivators takes time, and when the Great Formation operates at full force for extended periods, the foundation of the formation itself is inevitably damaged and needs repairing.
It's like a machine running at high load for a long time, which will lead to overload and overheating, shortening its lifespan.
