Summoning the heavenly tribulation was something that everyone in the Genesis Realm could do whenever they felt like it. However, it wasn't something that anyone did just because they could do so.
After all, being hit by one of the deadliest phenomena which was capable of destroying their body at a cellular level wasn't something that anyone desired for.
Also, even if someone was confident in bearing with the heavenly tribulation one time, they wouldn't be hasty enough to summon the heavenly tribulations immediately.
Everyone knew how the heavenly tribulation inside the Mortal Realm would strike a maximum of nine times. And the more number of heavenly tribulations they could take on and survive, it was that much stronger they could become.
In fact, based on the number of times someone experienced the heavenly tribulations there was a generally accepted level of strength they would be credited with by the others.
Those who could only withstand it one time were those who could only claim to be in the False Immortal Realm because their cultivation would forever be forced to remain at the same level and being able to ascend with their own strength was impossible as well.
Next, those who could withstand three or more of the heavenly tribulations were capable of further cultivating once they entered the Divine Realm.
As for those who wanted to ascend by themselves, they needed to withstand at least a minimum of seven heavenly tribulations.
Seven deadly lightning strikes which grew stronger.
Even though there hadn't been anyone who had experienced the ninth heavenly tribulation in many years, based on the records left behind by their predecessors, the ninth heavenly tribulation was something which was capable of eradicating all forms of life inside the Mortal Realm regardless of how strong they were.
This meant that those born in the Mortal Realm would never be able to bear with the ninth heavenly tribulation regardless of how strong they were and how many elements they had used to remake their body when breaking into the Genesis Realm.
...
Usually, when someone in the Mortal Realm was attempting to break into the False Immortal Realm by experiencing the heavenly tribulation, they would always make enough preparations before summoning the heavenly tribulation.
These preparations were also both external and internal.
Other than making sure that they were at their most optimal state, everyone would consume alchemy pills which would help shield them from the deadly lightning that the heavenly tribulations contained.
Also, they would all possess small glass balls which would attract parts of the lightning which struck them.
This would help in reducing the amount of lightning that would enter their body and ravage their insides.
Without either of these things, no one sane would ever attempt to summon the heavenly tribulation.
After all, even the first heavenly tribulation itself was so strong that even after breaking through to the False Immortal Realm many of them would have nightmares till the day they died.
But, Jian Shen didn't feel like he needed anything to assist him in his breakthrough.
With the Intent of Lightning being something he had comprehended to a considerably high level, and having used Lightning Qi to remake his body during his breakthrough into the Genesis Realm, Jian Shen felt more than enough confidence in withstanding the heavenly tribulations without any support.
There was also the vote of confidence given by the Qingyu and Juewang to him about how the Myriad Sword God Cultivation Technique was capable of absorbing the excess Qi of any of the nine elements that he trained in and use them to strengthen his own physique.
Therefore, he should just use the heavenly tribulation to not only withstand them and improve his existence to a level which wouldn't get destroyed during the ascension to the Divine Realm.
Thus, without any further ado Jian Shen let his conscious communicate with the Intent of Heaven and Earth around him to let the Mortal Realm know that he was ready to experience the heavenly tribulations.
Connecting his conscious with the heaven and earth, Jian Shen could now feel that the skies were getting ready to smite him with lightning and he could have the heavenly tribulations stop at any moment.
This allowed Jian Shen to understand how someone was able to make the heavenly tribulations stop when they felt like they reached their limits.
But, Jian Shen felt like he had no use of this because he was planning to bear with all the nine heavenly tribulations and not stop before he experienced all nine of them.
This wasn't just because Jian Shen was feeling curious to see how much more terrifying the tribulations would become with every succeeding one, but also to see how much stronger his body would become as a whole after experiencing all nine of them.
After all, Jian Shen didn't possess a strong physique which was honestly one of the aspects he was lacking in to be considered as an all-round powerhouse.
...
Once Jian Shen communicated with the heaven and earth to summon the heavenly tribulation, everyone in the surrounding area immediately understood that the heavenly tribulation was going to soon appear.
This was not only because of the dark clouds which were gathering in the sky and getting ready to attack Jian Shen, but the air around them was also visibly being filled with bright and sparkly yellow streaks of lightning which stung whomever they touched due to which they were all forced to move as away from Jian Shen as possible.
If not, once the heavenly tribulation began attacking Jian Shen, they would also be affected by it.
This was also when the sky had been completely covered by the terrifying pitch black clouds while first heavenly tribulation was gathering its strength to attack Jian Shen.