Lu Zhen wasn't surprised by the Heavenly Tribulation. The reason why nothing happened while breaking through to Soul Realm[1] was that he already had a soul, he was in a sense a Soul Realm expert the minute he was reborn and was just healing it.
Lightning Tribulations aren't normal occurrences, they usually occur if someone does something extreme that goes against the Heavens like slaughtering hundreds of thousands of innocent people or in Lu Zhen's case, creating something that doesn't exist.
The tribulation this time has something to do with his dantian, a normal cultivator would have a dantian that doesn't contain any energy. This dantian would gradually turn into a clay like substance as one continued breaking through, when the dantian is completely changed then one would consider himself an Earth Realm expert.
The so-called Human Realm referred to someone who had his clay like dantian molded into a human figure, this figure would resemble the cultivator and would be lifelike. The process was automatic, the person only needed to provide his dantian with energy that would be used to mold the figure. The human clay figurine increases a person's comprehension ability and brings them closer to the Heavenly Dao.
Now, Lu Zhen's dantian contains energy. And it wasn't ordinary energy but beast energy which any normal human cultivator shouldn't have, it shouldn't even exist in a human body.
The second problem is that Lu Zhen has deviated from the original cultivation path, since the energy is his, he is able to control it and therefore will carve his own figurine. This is a problem in itself, if Lu Zhen carves a sword figurine then he'll be unparalleled in the way of the sword, even a person with the Divine Sword Constitution would be incomparable to him.
This is an example of how Heaven Defying his cultivation technique is. This is also just the tip of the iceberg compared to what he could do, what if he divided his dantian into smaller pieces and carved different weapons or carved numerous human figurines, his future is basically unknown but definitely terrifying. This is why the Heavens are trying to eliminate him.
The six eyed dragon looked at him with its terrifying gaze as it slowly solidified. Lu Zhen had to wait for it to completely solidify, if he attacked it in its incomplete state then there was a chance that it could evolve to a Heptagon. He would definitely die if he faced it with his current cultivation level. He sat cross legged and continued cultivating, although he broke through to the Mortal Shedding Realm, he was also a beast cultivator.
He had to break through to the Enlightened Beast Realm. It is called the Enlightened Beast Realms because the beast's comprehension abilities are elevated to help them get closer to the Heavenly Dao and make it easier for them to comprehend techniques. The Heavens truly are fair.
The transparent crystalline orb in Lu Zhen's head emitted white energy which was then absorbed by his brain, this caused his brain to pulsate. The orb shrank as it emitted the white energy. Lu Zhen could feel the world become clearer and he now saw it in a different light. Lu Zhen sat there for months while waiting for his grand battle with the Hexagon.
…
In the Holy City everyone was anticipating Han Jiang's battle with Lu Zhen. "Did you complete your task?" Han Jiang sat in a dark room, a shadow figure was kneeling on the ground while he gave his report, "There is no news of him showing up, I don't know who that lady is but we got information of his slave. Apparently, that slave is a Prince of some beast kingdom. It is a two week trip to reach the kingdom using a carriage but it is shortened if you use a flying beast."
"Prepare a carriage, if he can't bring the fight to us then we'll bring the fight to him. I won't let you go this easily. I want you to die by my hands and that woman of yours, I'll properly enjoy her." a cold glint shone within Han Jiang's eyes. He wanted to rip Lu Zhen's to shreds, although they swore an oath, he wasn't satisfied with it, the shadow figure saluted and disappeared.
"Great! You did good by running away, you're able to use your brain after all." Fairy Qin Biyu was happy that Lu Zhen didn't show up for his battle. She thought it was better for him to die under Qi Deviation than to be tortured by Han Jiang. The bald guy was disappointed by the results but he knew that anyone who challenged Han Jiang was courting death.
…
Lu Zhen suddenly opened his eyes that were filled with mysterious characters. He looked up again, the Hexagon was about to complete its solidified state. Two crimson wings with blazing scales shot out from his back and he gently flapped them as he shot to the skies. He floated a hundred meters away from the Hexagon, "I don't like looking up to you or you looking down on me. Stop wasting time and let's get this over with."
The six eyes suddenly shot open, the gaze within the eyes was now more terrifying than before. A terrifying aura was released by the dragon, the surroundings became silent. Lu Zhen also released his own aura which didn't lose out to the dragon's aura. The two auras then clashed. "You can forget about kiling me, my future is boundless and limitless, even the likes of you aren't even close to comprehending it! You shall become my nourishment!"
ROOAARRR!!!
The dragon's roar reverberated throughout the minor world, the ground shook and the mountains crumbled. Lu Zhen was simply testing its limits.
Swoosh!
Both Lu Zhen and the dragon approached each other at breakneck speed. This fight would determine Lu Zhen's future, if he survived this then the Heavens would only be a stepping stone for him in his paththat's is filled with thorns.