"If you want, we can control the cauldron for you, husband."
"Huh? Didn't you tell me that neither if you could use Qi on your own?"
"In our current state, we really can't control Qi by ourselves. But, as long as we draw some Qi from you and store it inside us, we can continue using it even if you aren't holding us."
Nodding his head excitedly with bright eyes, Jian Shen generously poured all of his Qi inside the two swords until there was next to none Qi inside him.
Once he was done, even though Jian Shen himself felt very weak his eyes kept on shining like two miniature suns from how excited he was.
Flying out of Jian Shen's hands and touching the Nirvana Flame Cauldron with the tip in their respective sword form, Qingyu and Juewang who didn't need any manual to know about to how to use it started controlling it with ease.
Increasing the size of the Nirvana Flame Cauldron until it was big enough for a human to enter it, the two swords warned Jian Shen of how much it would hurt to recreate his body and change it in such a way that no impurity would ever enter it while at the same turning his body into something which made cultivation very easy.
Gulping down his anxiety, Jian Shen despite not being a fan of pain jumped inside the Nirvana Flame Cauldron after stripping naked.
Sitting cross-legged inside the pot which felt cold against his skin, Jian Shen's breathing instantly turned hard and rough from the anticipation of what would happen next.
Asking Jian Shen if he was ready, the two swords controlled the way their Qi entered the pot so that it quickly absorbed massive amounts of Qi and various Intents of Heaven and Earth from around it.
This was also when the two swords controlled the World Crest through Jian Shen and made a huge amount of Celestial Water enter and fill the cauldron.
The very same Celestial Water which was capable of increasing a person's lifespan by thousand years from just drinking a cup of it.
Once it absorbed a massive amount of Qi and the Intents of Heaven and Earth that it needed to function, the Nirvana Flame Cauldron first started increasing the temperature of its body before a spark finally appeared.
Turning bright red due to heating up, the Nirvana Flame Cauldron worked so mysteriously that even after the flames of Nirvana appeared inside it, it only heated the water and didn't evaporate it.
Half of the credit also went to the special Celestial Water, but less about that.
As the water started heating up, Jian Shen who was submerged inside it felt the true heat of it scald his body from outside.
But this didn't last for long as the water made its way inside his body, and started burning it from the inside out.
Having decided in what they needed to do, the two swords didn't destroy Jian Shen's entire body at the same time and instead changed it one part at a time.
Destroying and recreating it.
Starting from the most delicate parts inside his body which needed to be destroyed and recreated instantly if they didn't want there to be any negative impacts on him.
Recreating the heart first, the swords used peerless concentration to instantly change all the internal organs or him after which they began focusing on his blood, bones, muscles, meridians, nerves, and so on until his entire body had been changed.
Still, even though the two swords had changed the capabilities of his body so much, they had done it less than five minutes and didn't leave behind any signs that they tampered with Jian Shen's body.
Despite the fact that Jian Shen's body was now even more innately closer to all elements of cultivation and this in turn would make it very easier for him to cultivate, there were no signs on his body showing that anything had been done to him.
After all, he looked exactly like before on the outside.
Well, almost exact. Due to his skin being changed to make it easier for Qi and other similar things enter his body, it looked much more luscious resembling an outer body which only gods could possess.
...
Walking out of the pot of scalding hot water, Jian Shen who had gotten used to the heat due to stating inside it found it surprising at how the water hadn't reduced by the slightest even when it had turned so hot.
Instead, the water was filled with various liquids of black and white in colour.
With the black one being the various impurities inside his body, while the white one was the bad blood which had been removed after replacing it with a higher quality.
This was because completely destroying the blood inside Jian Shen and instantly recreating it was something that the two swords weren't confident in doing.
It was due to this that Jian Shen's bloodline of the Heavenly Dragon Bloodline was much purer than the strongest Heavenly Dragon to ever exist.
Still, even though Jian Shen wasn't feeling any signs of being hot on his external body, he felt as if he was being burned up from the inside out due to which as soon as he stepped out of the Nirvana Flame Cauldron his body started staggering and showing signs of fainting at any moment.
Luckily, the two swords had already expected for such a thing to happen due to which they had the two women who trained their bodies in pure Yin type techniques have everything prepared inside the World Crest to help him out.