Although Nangong Yan used footprints to leave spiritual power trajectories to connect various spiritual power modules, but at the critical place, he still left fire spirit stones to amplify, but the fire spirit stones he used were as big as rice grains, and Ye Lingxi couldn't see clearly even if he held a telescope.

The fire spirit stone is produced from the mountain closest to the center of the Soul Shifting Realm from the Fire Mountain Range, which is also the place where the fire element in the Soul Shifting Realm is the richest, and it requires a strong person above the Spirit King to mine it when the fire element is weakened from the Fire Realm on the day of the Extreme Yin, so the value of a piece of Fire Spirit Stone is unimaginably high.

However, the good news is that if the Fire Spirit Stone is used for weapon inlay or formation core after transformation, it is a renewable resource and can be recycled.

Nangong Yan took out a fire spirit stone from his ring and handed it to Ye Lingxi: "That's it, I carved a total of sixteen fire spirit stones before, which are used to act as energy when setting up the formation, this is the most basic energy material, as well as other materials with various functions, carefully combined to give effect to the effect."

Like the day I did, the Heavenly Tribulation came too suddenly, and I just hastily made a flame formation to provide additional spiritual power for me and the Vermilion Bird Transformation, otherwise, even if it was the last wave of the Heavenly Tribulation, I would have been able to lie down!"

This is the self-confidence of a formation genius!

In fact, the rune seal and the formation are also a part of a person's cultivation, to measure two people, especially the two people who are almost the same in rank, we must first see whether there is a rune seal or the "sub-profession" of the formation, to what extent the sub-profession has been, if one party has it, one side does not, then the balance of victory is completely tilted~

Because cultivators with sub-professions are more flexible in their attack methods, and they also save spiritual power, because whether it is a spell or a formation, it can be regarded as a "backup hidden energy".

Ye Lingxi took the fire spirit stone and put it in front of him to look at it.

There is a symbol on the fire spirit stone, which is not particularly small, at least it cannot be compared with the miniature spiritual power module in the spell.

"This symbol can release the stable fire aura inside the fire spirit stone when you need it, and if this symbol is carved by the owner of the fire spirit power, it can also convert the fire spirit energy into fire spirit power, although the effect will be discounted, but it is very convenient. ”

Ye Lingxi tried to touch the center of the symbol with his spiritual power, since it was a product of the cultivation world, then using his spiritual power to test it would definitely have an effect!

In his senses, the spiritual power encountered a fork option in the process of activating it, with fire spiritual power on one side and fire aura on the other.

He didn't hesitate to choose the fire aura's side.

Laugh at!

It seems to have pierced through a thin film, and then a steady stream of fire aura seeped out of the fire spirit stone~

The fire spirit stone can be regarded as a solid fire aura aggregate, after transformation, it will not be released cleanly, but slowly released, the release process will reduce the density of the spirit stone body, and after the density is reduced to a certain extent, it will stop, and instead absorb the external aura to return to itself.

What a useful treasure!