After ten years, Zhou Fan mastered 3rd rank pill making. In those ten years, the amount of materials he had used was enormous. Now, even the plains were filled with so many plants that they could be called a jungle. As for what was once jungles, they were nothing but great tangles of plants taking over an area.
The most unaffected places were the mountains. Still, one could tell from the layer of grass that covered them like hair that they were not untouched.
Despite the immense amount of plants, the world was not really harmed. Instead of resisting the change brought about by the plants, it seemed to go with it. Animals were now evolving into more jungle-like creatures and insects were becoming more common.
One problem that the world was facing was the water shortage since every body of water besides the oceans were completely taken over by algae and other water plants.
By now, the fish population that lived in freshwater had gone extinct. The worst part is that the lack of water would have a bad effect on the plants since they naturally relied on it to survive.
Luckily, the role of water was being carried out by Zhou Fans life rain, but it wouldn't be there forever.
It seemed that the planet was creating more and more natural rain in order to make up for the losses of water, but there was only so much water it could take from the ocean.
Also, at the current rate, the ocean would too be taken over by water plants. While Zhou Fan was thrilled to see the increase in plants, he was not thrilled to see that one of the planets under his mortal dao was facing a possible future extinction.
Therefore, after some thinking, Zhou Fan manipulated the world a little. Instead of going in the normal direction of growing plants, it would now work on evolving plants to be able to survive on only air, and sunlight instead of water.
It would definitely be a major change, but Zhou Fan saw no other way out for the world. Now that he had settled that issue for now, he could continue on to 4th rank pills.
With the world's overgrown plantage, finding 4th rank herbs was absolutely no problem. After 30 years, Zhou Fan managed to master 4th rank pill making. His pills still had little to no effect on him, but like formations and arrays, new types of pills were becoming possible as the rank increased.
He was now at nascent soul level pills and pills that messed with the soul were now somewhat possible, although barely. He had thought that he would struggle to make soul type pills due to the fact that it seemed unlikely the world had any soul type plants, but he managed to find an entire growth of them in an underground cave system.
As the rank of plants increased, their variations did as well. On the top of some mountains, there were flaming plants and at the bottom of the ocean, there were freezing plants. Due to the world's diverse environment, there were many types of plants in many types of places that made many things possible.
Another example was the poison plants that usually took over swamps. They could be used to make poison pills. The poison pills were fairly powerful, but it took really rare materials to create one that could kill an 8th level nascent soul realm cultivator and higher.
As he moved on to 5th rank pills, Zhou Fan experimented and developed a way to store pills. An issue he had earlier had led him to such a creation. He noticed that after around ten years, most of the 1st rank pills began to rot and become useless.
With his new invention, a jade bottle with formations covering it, storing pills was now easy and simple. The jade bottles extended the first rank pills lifespans largely, but the exact amount was yet to be seen.
It took Zhou Fan 100 years to master 5th rank pill creation. There were now more pills dealing with the soul in one way or another, and the effect of those pills was much better on average.
Many more elemental and non-consumptive pills were also available. For example, there was an awfully powerful pill that simply exploded as soon as it was either swallowed or met with an intense force.
Without paying too much attention to the 5th rank pills, Zhou Fan was ready to move on. Sadly, there was once again an issue of plants. Zhou Fan felt that if he pushed it more he may actually end up hurting the planet, but he decided to risk it. Either the planet would evolve with the once again increased life rain and the increased amount of powerful plants, or it would become a wasteland incapable of housing any sort of life whatsoever.
After making even more life rain, Zhou Fan collected the rare 6th rank materials that managed to evolve on the planet.
They would only last him about a month, but that would be more than enough time to tell whether or not the planet would fail or succeed.
As Zhou Fan used the last void traversing level plant, he looked around at the world. Directly adjacent to his mountain, which had been untouched by plants due to an array he set up, there was what seemed like a mountain covered in plants so thick that one couldn't even see the stone.
Not only was it weird that a mountain magically appeared out of nowhere, but it was also weird that, when one looked closer, they would realize that there was no stone beneath the plants.
In fact, the entire mountain was actually just a gathering of plants. Covering the mountain was an extremely large amount of 4th rank, 5th rank, and 6th rank plants. In some places, there were even some 7th rank plants.
Also, this was only a mountain. The plants found on it were usually of the most basic quality.
Clearly, the world had successfully evolved.