Ultimately, after browsing through the treasury, Li Yun chose a sword formation.
This sword formation was called the Violet Thunder Sword Formation.
It consisted of three thousand precious swords, each of which was a middle-grade Heaven Rank precious sword. Combined, their value was comparable to a low-grade Spirit Rank spiritual artifact.
Furthermore, the Violet Thunder Sword Formation could draw upon the power of lightning.
When the sword formation was activated, it could release lightning against enemies. As for the amount of lightning that could be released, that would depend on various factors, including the cultivator's strength and level of control over the sword formation.
Truthfully, the value of this sword formation exceeded ten thousand Source Stones.
However, because Li Yun was about to participate in the Central Continent Heaven's Chosen Assembly, the elder in charge of the treasury eventually gave him a green light and allowed him to obtain the sword formation.
