However, Zhou Xun could not spend all his time here.
After pondering for a moment, he decided to leave the lightning sword here to be slowly nurtured while he himself headed deeper in search of treasure.
Then, Zhou Xun waved his hand, and a giant spiritwood box around five feet long appeared before him.
Inside was a Tier 4 Upper-Grade formation—the Five Clouds Purple Lightning Array.
This formation was a Tier 4 Upper-Grade formation recorded in the Thundercloud True Arts cultivated by Zhou Xun.
It was an exceedingly rare lightning-attribute formation, integrating attack, defense, and enemy-trapping into one. Even great cultivators would find it difficult to break through.
With this formation standing guard here, even if others happened upon this place, they would be unable to breach it in a short time, ensuring the safety of his Mystic Thunder Sword.
With a gentle toss of the wooden box, three hundred and sixty formation flags flew out and hovered in the air.
Zhou Xun narrowed his eyes slightly, his hands forming seals as swiftly as lightning while his lips murmured incantations.
Streams of purple lightning burst from his fingertips, striking every formation flag with precision. The flags immediately began to hum as intricate Lightning Runes surfaced across them.
"Fall!"
With a sharp cry, the three hundred and sixty formation flags scattered like heavenly maidens scattering flowers, embedding themselves around the Lightning Magma Lake according to specific positions.
The instant each formation flag landed, it stirred a ring of rippling purple lightning.
"Five Clouds Gather Lightning, Purple Qi Comes from the East!"
Zhou Xun released his final streak of spiritual light.
"Rumble—"
The entire Lakeheart Island began to tremble, while the thunderclouds in the sky churned madly.
Countless bolts of purple lightning struck down from the clouds, only to be drawn in