At Lava Pool no. 19, Shi Mu lodged every single one of the Mid-rank Fire Attribute Spirit Stones into the troughs. With that, he had completed the setup of a circular formation—indeed, he was setting up the Incendiary Formation—on the charred, sandy area around the lava pool. The only significant difference was that Shi Mu had swapped the default Infernal Polaris Stones with Fire Ores.
Once every trough had a Fire Ore inserted, the whole formation complex began to emit a soft, red glow as a faint buzzing sound could be heard.
Then, in the middle of the formation, the boiling lava in the pool suddenly spun frenetically on its own until it formed a whirlpool. Very soon, the temperature of the entire area rose exponentially as Fire Attribute energy imbued in the atmosphere multiplied.
Shi Mu sighed, relieved that the old man was right—not only did the Incendiary Formation start its operation successfully, but its effects were also even better than before.