The suddenly appearing violent lightning shot skyward at astonishing speed. It did not target Su Shi'er, but instead met the dazzling lightning descending from above.
Within the violent lightning, a low roar could faintly be heard.
Amid it, the small, thin figure of the spirit creature Thunder Essence could vaguely be seen.
Compared to the Cloud Dragon, White Tiger, and even other demon beasts, Thunder Essence was simply minuscule.
Even though its cultivation realm had soared all the way upward, Thunder Essence's true body was only the size of an infant.
Amid its low hisses, Thunder Essence's eyes rolled about, filled with desire and greed for the power of lightning.
As a spirit creature condensed from the essence of lightning power, Thunder Essence possessed an astonishing craving for all lightning power.
The Divine Thunder Source that Su Shi'er had mastered back then had been swallowed and refined by Thunder Essence.
Now, Thunder Essence had suddenly appeared without Su Shi'er's summons. Its purpose was self-evident.
"This little fellow really has guts.
"It actually dared to break free from the Small World on its own and directly face the terrifying lightning above.
"Thunder Essence was born extraordinary and is filled with an extreme craving for all kinds of lightning power.
"I just wonder whether it can truly withstand the lightning power within this Lightning Tribulation."
Su Shi'er murmured softly.
Under normal circumstances, Thunder Essence leaving the Small World on its own would absolutely have displeased him.
After all, whether Thunder Essence or the other demon beasts, they were all his spirit beasts, under his control and command.
Breaking free from the Small World on its own meant that a spirit beast had escaped its master's control.
Not only him—any cultivator in the Cultivation World would find it difficult to remain indifferent and