Is that a Wisp?

"As for the cultivation chamber, let us three ladies complete it. We've been working on it all this time and wish to complete it on our own," Feifei said, surprising Krune and Zamura. 

"Are you sure? Don't you need the two of us to forge the construct?" Krune asked, feeling left out all of a sudden.

"We don't." The Seamstress laughed as she told the two, "Feifei figured out a method that could be used to create a natural cultivation chamber. Well…just observe it for now."

"Give me the Godly Vein," Zamuria asked while facing Zamura. 

For a moment, he was pretty happy that his mother talked to him on her own initiative, giving her the final Godly Vein immediately. 

The group then used Krune's subspace as a convenient mode of transportation, arriving at a massive stone island that was situated 1000 kilometers away from the Sub-Realm's entrance. The moment they arrived at the place, the two men were shocked to see a mountain formed by precious minerals. 

"Zamuria has been harvesting all the materials while Seamstress refined and removed the impurities from all of them," Feifei started to explain, sporting a smug look. "And I laid down a formation in each of them."

"You didn't forge anything here," Krune said, pointing at the place where all the materials were simply scooped to form a massive hill. "How can that do anything?"

"Just wait and see." Feifei grinned. "This is a method that the two of you can never use to forge items."

"What is it?" Zamura asked, fully curious now.

"Tribulation Lightning Forging Technique," Feifei said. "You'll understand when you see it in action."

Right at this moment, Zamuria carried the Godly Vein and burrowed into the hill of materials, saying after a couple of minutes, "I'm ready now."

"What do you think is the reason we face a tribulation?" Feifei asked all of a sudden, causing the two men to look at her in confusion.

Zamura replied in a matter-of-fact tone, "Cultivation is the process of going against the heavens. So, the tribulation lightning is the method in which the heaven uses to stop us."

"But, if that was actually the case…" Feifei said while grinning, "The tribulation lightning shouldn't ever stop and persist until we are reduced to ashes. Also, why is it that some of us manage to survive and become even stronger?"

She then looked at Krune and asked him, "Didn't you spend most of your life with Luvile? How come you never understood his essence?"

Before Krune could reply, Feifei replied, "It's actually simple. The tribulations are just a checkpoint to ensure only cultivators with a certain level of strength can attain the higher cultivation bases. Their true purpose is to allow the cultivator to deepen their comprehension of the laws during a breakthrough."

"This is only true in the God Realm." She continued, saying with a hint of seriousness, "Through the tribulations, you'll gain comprehension of your laws. If you're lucky, you might also be able to glean into a whole new law."

"Now, what we're doing is the same." Feifei laughed, checking through the pile of materials once before saying, "Zamuria, you can begin!"

Boom!

Right as she finished talking, the sound of thunder resounded as a thick bolt of lightning landed on the hill of materials, causing all of them to emit a blinding hue. By the time the bolt of lightning reached Zamuria, who was at the bottom of the pile, it lost all strength, having been absorbed by the materials surrounding her. 

It seemed as if the heavens were enraged with such an arrangement as the tribulation clouds formed overhead, condensing more and more as a suffocating presence emanated from the place. It quickly surpassed the amount that the collective might of the Predominated Vines from before could bring forth. 

It showed Zamuria's accumulation and how strong a cultivator with a Spiritual Incarnation was versus one without. 

Within a couple of seconds, the second bolt of lightning landed, now ten times thicker than the first, immediately causing a lot of the piled materials to spill out. However, Zamuria waved her hand once, pulling them all back into place.

"Is she…manipulating the pile of materials on top of her breakthrough?" Zamura asked in shock. 

"Yes." Feifei nodded as she told them, "This is a necessary procedure. We're using her tribulation to refine the materials and fuse them into a singular structure. Since she's the target of the tribulation lightning, as long as she remains the core of their formation, what we wish to accomplish would be done."

"Amazing!" Krune looked at the scene in shock, watching the materials melt one after another as they flew towards Zamuria. 

In response, Zamuria seemed to be moving them, causing the lightning bolts to first hit them before reaching her. As she always ensured to prevent the lightning bolts from actually hitting her, the tribulation clouds continued to increase in density. 

Slowly, the strength exhibited by them continued to climb as they reached the late stage of the Semi-God Realm. 

Zamuria wasn't a regular cultivator at the Ninth Stage Nascent God Realm. She also had a Spiritual Incarnation while her body was tremendously tough. So, the strength of the tribulation lightning had already surpassed what any cultivator could incite during their breakthrough to the Semi-God Realm. 

Adding onto her scheme, it seems that the heavens were indeed angry as the tribulation clouds soon spiked in strength once again, stabilizing before unleashing a tremendously powerful bolt of lightning. 

God Trial Realm!

"Aaargh!" Zamuria bellowed a battle cry before taking out the Godly Vein, using it as a defensive tool to defend against the tremendously powerful bolt of lightning that directly melted all the materials forming the hill.

"Mother!" Zamura was shocked, intending to rush to her rescue immediately when Feifei and Seamstress stopped him. 

"She'll be fine. Don't interfere!" The both of them said solemnly, almost cold, looking like they might take action if he did anything to disrupt their plans. 

Unwilling to cause a scene, Zamura noticed that his mother was persisting, calming down a bit, noticing the pile of materials forming a hill before had now turned into liquid, revolving around Zamuria as her figure began to float into the air. 

As for the Godly Vein in her hands, faint lightning flickered forth from it.