Picking up the dark yellow crystal on the ground, Lin Feng temporarily put it in his doomsday watch. At this moment, a large number of zombies have not been dealt with, and there is no leisure time in the world to study the topaz.

Picking up the six-barreled machine gun from the ground again, and reloading a plate of bullets, Lin Feng picked up the machine gun and fired at the approaching zombie group.

The fact that the machine gun has no effect on the third-level zombies does not mean that it is also ineffective against the ordinary zombies in front of them. Under Lin Feng's strafing, a large number of zombies fell down.

Lin Feng had plenty of ammunition, and after using three sets of bullets, he finally wiped out the group of corpses. The few remaining second-level zombies were not shot by the machine gun, but they were all killed one by one by Lin Fengxuan's iron bayonet.

It's a pity that there are no black balls in the heads of these second-level zombies, but light yellow crystals. Now Lin Feng is familiar with dealing with level 2 zombies, killing them is as easy as chopping melons and firewood. As long as there are not too many of them, Lin Feng can usually handle them.

After Lin Feng cleaned up, there were no more zombies within a thousand meters. The passage between Lin Feng and the entrance to Tianheng Mountain was completely opened.

Seeing that nothing was happening around, Lin Feng took out the light yellow crystal from the brains of the second-level zombies he killed before, and the dark yellow crystal obtained after killing the third-level zombies from the doomsday watch.

Today, Lin Feng is already a fourth-level cultivator, and the effect of absorbing white crystals is really limited. Whether it is the energy obtained or the growth rate after absorbing the white crystal, the effect is much worse than before level 4.

Yellow crystal is much higher than ordinary white crystal in terms of energy quality and quantity. This is why yellow crystals are much more precious than white crystals in the last days.

Before coming to the foot of Tianheng Mountain this time, Lin Feng obtained a total of ten topaz, nine of which are light yellow and one dark yellow. Lin Feng showed that he picked up a light yellow topaz, held it in his hand, and felt the energy in the topaz.

A wave of energy emanated from Lin Feng's soul and passed to the yellow crystal in his hand, and then a suction force came from Lin Feng's hand, and the soul was absorbing the energy in the yellow crystal in Lin Feng's hand.

Lin Feng could clearly feel that the energy transmitted from the yellow crystal was much higher than that of ordinary white crystals, and the quality and purity of the energy were also extremely obvious.

After a while, the yellow crystal in Lin Feng's hand was already dim and colorless, and all the energy in it was absorbed by the soul in Lin Feng's mind.

As expected of the yellow crystal produced by the second-level zombies, Lin Feng felt that absorbing this yellow crystal was comparable to absorbing a hundred ordinary white crystals.

It's not that one topaz is equivalent to 100 white crystals. In fact, when Lin Feng absorbs white crystals, the amount he absorbs is limited every day. Currently, after Lin Feng absorbs 20 white crystals every day, he can no longer absorb the energy in them. After finishing a certain amount of white crystals, the soul seemed to digest the absorbed energy.

This created a bottleneck, and Lin Feng couldn't absorb more white crystals in one day. But the current yellow crystal is different, one yellow crystal is worth 100 white crystals, that is to say, now Lin Feng absorbs the energy of one yellow crystal at the same speed as he absorbed five days of white crystals in the past.

Not only is it a matter of speed, the energy purity of the topaz quilt is obviously much higher than that of the white crystals. The effect of the topaz absorbed by Lin Feng is much higher than that of absorbing a hundred white crystals.

To give a simple example, with Lin Feng's current level 4 cultivator level, he needs to absorb the energy from 10,000 white crystals to reach the level 5 cultivator level. However, Lin Feng can only absorb 20 white crystals a day, and it takes 500 days to upgrade.

But Lin Feng absorbing one topaz is equivalent to 100 white crystals, and the energy purity of topaz is much higher than that of ordinary white crystals, so absorbing one topaz is almost equivalent to absorbing the energy of 200 white crystals. In this way, only 50 yellow crystals are needed, and Lin Feng can reach the level of cultivator level 5.

Of course, this is only a theoretical value. In fact, each level 2 or level 3 zombie has different abilities, and the energy contained in the topaz is also different. Besides, cultivators who have been promoted to level 5 cannot use simple numerical calculations, otherwise, the world has entered the end of the world for three years. If every cultivator absorbs white crystals or yellow crystals every day, wouldn't everyone be able to Reaching the level of advanced cultivators, and in the last days, it is impossible for there to be one or two cultivators.

The improvement of a cultivator's level is not only based on the speed of absorbing crystal energy, but also varies from person to person. Every cultivator has a different mind and soul. Similarly, every cultivator has a different physical quality and potential. Therefore, not all practitioners improve at the same speed.

After absorbing a yellow crystal, Lin Feng felt that the energy in his soul had increased a lot. At this point, Lin Feng decided that as long as there is an opportunity, he will try to absorb yellow crystals as much as possible. Ordinary white crystals will not improve the level very obviously.

Of course, all of this is based on the premise of having yellow crystals. No one will sell yellow crystals to the extent that they are so precious in this world. If you want to absorb Huang Jing, you must hunt high-level zombies yourself. In the base, Huang Jing may not be able to buy it even if he has money.

On weekdays, Lin Feng basically stayed at the base, and this trip was just an opportunity. While looking for mandala flowers for Ling Tian, ​​Lin Feng decided to hunt for more yellow crystals. Only by constantly improving his own strength can he survive better in this apocalyptic world.

Lin Feng continued to absorb the remaining few yellow crystals, powerful energy continuously poured from the yellow crystals in Lin Feng's hands into the soul in Lin Feng's mind. The spirit emits a little bit of silver, flashing and flashing, constantly devouring the energy of the yellow crystal.

The soul stopped until it absorbed 9 light yellow topaz, but the dark yellow topaz was still in Lin Feng's hands, and it was not absorbed by Lin Feng's soul.

Lin Feng felt that after absorbing the nine yellow crystals, his own strength had increased by at least two levels compared to before. In order to prove the increase in strength, Lin Feng took out his doomsday watch and checked his combat effectiveness.

Sure enough, the doomsday watch shows that Lin Feng's combat power has reached 1230, ranking more than 1500 in Tianqi City. Through the absorption just now, Lin Feng's standing has increased by more than 200 points.

As for the dark yellow topaz, Lin Feng can't absorb it now, so he can only put it in the doomsday watch and use it after the soul has digested the current energy.

Taking a deep breath, Lin Feng looked towards the entrance of the Weather Mountain Range.

What Lin Feng saw was one of the many entrances to the Tianheng Mountains. It consisted of two cliffs. The width of the entrance was no more than five meters. After Lin Feng's concentrated shooting at the entrance, there were no zombies.

Walking towards the entrance of Tianheng Mountain, Lin Feng finally wanted to enter Tianheng Mountain to find out.