Fantasy: The system takes me to refine the magic formula

At night, Long Tian found a big tree, which was 300 meters high!Moreover, many night demon bats landed on the top of the tree. Each bat is as big as a dragon and sky. This kind of bat is a social monster and is highly poisonous, but it is also very fragile. Wu, these night demon bats suffered heavy casualties, and the rest were scared away!

Long Tian found a hole in the middle of the big tree, cleaned it up, arranged a protective cover around it, then closed his eyes and took a good rest!

Although cultivators don't need to rest, Long Tian has been running around these days. Although his mental strength is obviously good, the practice of combining work and rest is the best!
At night, when the moon was in the sky, there was a loud explosion. Long Tian was awakened by the faint vibration. He was a little dissatisfied, but he was relieved. This is the forest of monsters. Many monsters come out in the middle of the night to look for food, and they also have a sense of territory!
Long Tian removed the protective cover, walked outside, and looked in the direction of the sound source!
At this moment, a three-tailed fox is fighting a red-bellied spider!
This is the first time that Long Tianzai has seen such a huge insect-type monster other than his master's Flying Mantis!
The flying praying mantis I saw before was about the size of a human being, and the two huge scythe pincers could easily defeat the enemy, while the red-bellied tail spider in the distance was actually the size of a small truck. I want to tie up the three-tailed demon fox and eat it straight away!
It's just that no matter how many silk threads spit out by the red-bellied tail spider's tail, they are all burned by the flames spit out from the mouth of the three-tailed demon fox!
And the red-bellied spider was not to be outdone, and directly stepped forward to fight at close range. The eight claws hooked the ground forcefully, and then opened them instantly. The reverse force made the red-bellied spider jump directly above the three-tailed demon fox, and then Fall fast!
The three-tailed demon fox dodged again, spitting flame swirls frantically at the red-bellied tail spider!

The red-bellied spider was not afraid, and also spit out green poisonous gas at the three-tailed demon fox. The flame and poisonous gas collided again and a strong explosion occurred!

Long Tian understood, it was just such an explosion that woke him up!
The two monsters in front of him were still fighting. Long Tian looked at it. The three-tailed demon fox was a level five monster, and so was the red-bellied tail spider. This kind of monster basically didn't help Long Tian, ​​and even the magic core was useless!
Long Tian watched for a few more minutes, and the two monsters could not do anything to each other. Long Tian guessed that one of them would leave impatiently after a while, and it would be quiet!
Back in the giant tree, after building a safety barrier again, Long Tian directly turned off his auditory perception this time, and slept peacefully!
This time it was really dawn, and it was almost noon when Long Tian woke up!

Starting again, passing by the place where the two monsters fought yesterday, the surrounding trees and plants have been razed to the ground, and there are still a few red-bellied spiders' feet on the ground, so we know that the red-bellied spider must have fallen last night escaped!
Long Tian, ​​who was on the road again, has already entered the middle area of ​​the monster forest. The monsters here are mostly around level five. There are even many golden eagles and six-clawed vultures hovering in the sky in the distance. The breath of the dark dragon exuding from his body is still very frightening, he just hovers and hunts from a distance, and dare not approach Longtian!

Looking at the monsters around him, Long Tian was a little afraid of him, which made Long Tian a little bored. He came to find monsters and spirit beasts to be his magic pet. Now that he is in this state, he might enter the most central area. Eighth-level and ninth-level monsters will also be afraid of him!

"Hehe host, that's why the system wants you to take that super ninth-level beast as your own spirit beast! And the system is also very curious, what is the monster in the middle, the system can't recognize its true face! There are The interference of the energy shield!"

"Well, I see!"

Long Tian continued to fly, and after a day, there were almost no low-level monsters around!This marked that Long Tian had completely entered the inner layer of the monster forest, and the surroundings should be surrounded by monsters above level eight!
"Host! Two kilometers ahead, there is a thousand-year-old cold moon grass underground! It can be regarded as the top spiritual grass of the earth!"

"Received!" Long Tian flew directly to the place to mine!
"Host! On the cliff 4 kilometers to the west, there is a licorice plant with ground-level spirit veins!"

"Host! There is a Yueluo fruit by the lake 1km to the east! But you have to be careful of the sneak attack of dangerous monsters in the lake!"

In this way, under the guidance of the system, Long Tian quickly searched for all kinds of spiritual grasses and fruits in the entire forest of monsters, but most of them were earth-level ones, and there were basically no sky-level ones, which surprised Long Tian!
"System, why are there no heavenly spirit herbs?"

"It's not bad to have an earth-level one! It takes at least a thousand years for a heaven-level spirit grass to conceive a single one. This kind of spirit grass is always stared at by people or monsters, and picked off immediately until it matures! You thought it was a roadside plant. Grass, do you pick it casually? These ground-level spiritual grasses are only found in some weird places! Without a system, you can't find it either!"

"So that's it! I got it! These spiritual grasses of mine are all planted next to the fairy grasses! It is estimated that it will take less than a thousand years for these ground-level spiritual grasses to become sky-level ones!"

"Hehe host, be careful, there is a silver moon magic wolf staring at you in the distance!"