Having comprehended the formation formed by the twelve pillars of fire, Lu Xiaotian moved his divine sense, and a Phantom Spirit clone separated from his body. A secondary Primordial Spirit attached itself to the clone, continually refining the Profound Fire Pillars and controlling the twelve pillars as they slowly shifted, endlessly enacting the myriad changes of the twelve celestial cycles.
Lu Xiaotian's true body watched from the side for a while. The Phantom Spirit clone's strength was limited. Before he had grasped the mysteries of the fire formation, the clone had been incapable of demonstrating its variations. The expenditure of magic power was too great, and the clone simply could not keep it up for long. Under these circumstances, the true body's role was irreplaceable.
But after he had comprehended the method of the Profound Fire Trap Formation, following its predetermined course and proceeding step by step greatly reduced the expenditure. Even the Phantom Spirit clone could sustain it for quite some time. This allowed Lu Xiaotian to step away and attend to other matters while cultivating the Profound Fire Trap Formation.
Cultivating more divine abilities was not necessarily better. If Lu Xiaotian did not have several secondary Primordial Spirits, the pill room alone would keep him busy enough. How would he have time to cultivate divine abilities? It was not just the consumption of Spirit Stones and other resources; his Primordial Spirit alone could not bear the strain. Trying to do too much at once and mastering none of it applied just as much to a Body Integration expert. If the fire-path formation in the Great Yan Fire Canon had not suited Lu Xiaotian so well, he would never have readily spent so much effort cultivating another divine ability.
Still, controlling the twelve pillars of fire took some effort.