A message emerged in his mind.

"Level 4 Spiritual Source: Spiritual Source 49/50"

"Level 4 Spiritual Source: Spiritual Source 50/50"

"Start promotion"

"Muscles begin to strengthen, strength increases"

"The basic strength has been increased to 1,000 pounds"

"The defense increased by 100 kilograms"

"Physical energy, speed, vision, hearing"

"The lung capacity increases, and the basic breath holding time is extended by one minute"

“…”

"Promotion completed"

"Level 5 Spiritual Source: Spiritual Source 0/70"

"Talent: Strengthening favor"

"Basic Strengthening: Strengthening lung type I (extending breath holding time for two minutes)"

"Basic Strengthening: Muscle-Breaking Type IV (adding additional strength by 900 catties)"

"Special skills: peeping runes (blemishes), binge-eating teeth (left), spider walking"

"Basic strengthening choices: strengthening lung type I, muscle type IV, teeth, bladder"

"Start to understand the art of spiritual source"

"Spiritual Source Technique: Steel Muscles and Devil Muscles, you can choose one of them to understand and master them."

In my mind, a large amount of information emerged one after another, and there are four basic strengthening options: lungs, muscles, teeth, and bladder.

Zuli needs stronger strength to fight against the extremely terrifying undead monster in front of him. Strengthening the lungs can only prolong the time to hold your breath. Although the specific effect of strengthening teeth and bladder is unknown, Zuli guesses that it must have nothing to do with strength. If you want to improve your combat power, your only choice is to continue to strengthen your muscles.

His muscles have undergone four strengthenings. Although they have brought him unprecedented powerful strength, they also made Su Li afraid that other parts of his body will find it difficult to withstand such powerful explosions. So this time he had already thought about it and decided not to strengthen the muscles for the time being, but instead strengthen the other parts of his body.

But I didn't want to encounter this terrible undead now. There is no other choice between life and death. I can only improve my combat power as much as possible, and wait until the other ones kill the undead, otherwise I will not even be able to save my life. No matter how much I think about it, it will be meaningless, let alone he has another chance to strengthen.

As he made his choice, his muscles were squirming immediately, as if they suddenly came alive.

""Muscles begin to strengthen, muscle-building type IV is promoted to muscle-building type V, and an additional muscle strength of 1,200 kilograms"

"The muscles have undergone five strengthenings and have strengthened to the current level and the limit that the body can withstand. They cannot continue to strengthen. The basic strengthening cannot exceed the current level several times."

Sensing the message in his mind, Su Li immediately understood that the number of basic strengthening times is also limited, and it cannot exceed the level in front of him and the limit that his body can withstand. He is now a level 5 spiritual source, which means that his muscles can only be strengthened at most five times. If you want to continue to strengthen your muscles next time, you can only improve your level again.

"It seems that everything I thought about before was too much. This basic strengthening choice has long limited the limit of strengthening. I am still considering whether excessive muscle strengthening will make other parts of the body unable to bear it. As a result, I was worried in vain." Zu Li was relieved and breathed a sigh of relief.

"There was no such prompt for the fourth muscle strengthening at level 4, but this time it appeared. It seems that the last fourth muscle strengthening has not reached the limit that the body can bear."

Based on this speculation, there should be two restrictions when choosing a certain part of the body to strengthen. One is that the number of times the same part cannot exceed the current level. The second limitation is the body's ability to bear. If the strengthening of a certain part reaches the limit that the body can bear, it will also be warned to restrict its continued strengthening.

These two limitations are not consistent. For example, after hard training, a person's muscles are already particularly developed before becoming a spiritual source, far beyond ordinary people. Then, when this person becomes a level 5 spiritual source, his muscles may have reached their limit in just four strengthenings, and he cannot perform the fifth muscle strengthening.

When Zuli was an ordinary person, he did not have such muscles that were far beyond ordinary people, so his current limit of muscle strengthening coincides with his level.

Another new message appeared in Zuli's mind.

"The ability of talent to 'strengthen favor' is triggered, and you will get an additional opportunity to strengthen. You can strengthen the choice of strengthening lung type I, muscle type IV, heart, stomach."

"I finally made my heart's choice." Su Li was delighted.

Sensing the messages that kept appearing in his mind, the undead in front of him had already rushed to him.

Su Li didn't have time to carefully sense the message and made a second choice. With a angrily shout, he grabbed the machete in his hand with both hands and slashed towards him.

As he was promoted to a level 5 spiritual source, his basic strength reached a thousand kilograms, and the muscle-building V type can enhance an additional 1,200 kilograms of strength, and his strongest strength has soared to 2,200 kilograms.

Compared to the previous level 4, his strength has been increased by 500 kilograms.

Not only strength, speed, physical strength, reaction, and defense have been improved, and the muscle defense ability has been increased from the original 500 kilograms to 600 kilograms, which can resist and offset more powerful attacks.

With Su Li's angry shout, the machete carried a sharp wind and slashed out, and the speed of attack was faster than before.

The undead stretched out his mutated claws and used them to resist without fear. Unexpectedly, Su Li's sword was a false move. He had already activated the "spider walking" and went around to the other side of it. The "glutty teeth" in his left hand blasted out.

With a "bang", the undead also launched a head ejection attack at the same moment. As a result, Zuli's "Gluttony" hit the undead's ejection forehead.

Four sharp fangs pierced into the undead's head.

Blood splashed out, and the undead's mouth let out a roar, and suddenly retreated like an electric shock. The ejected head hurriedly shrank back, widening the distance between him and Su Li, his face turned pale, and four blood holes appeared on his forehead, and blood was constantly emitting out, with white substances faintly inside.

Zuli did not pursue him immediately, but instead took advantage of the additional strengthening opportunity he just obtained and decisively chose to strengthen his heart.

Su Li let out a deep breath. He had long noticed that his heart was beating violently during the battle, and he felt unsustainable. However, he had never had the choice to strengthen his heart. This time, he finally came out.

"The heart begins to strengthen, and you will get super heart type I. The physical strength doubles, the strongest power burst lasts for two minutes, the super heart increases for an additional three minutes, and the extra strength increases for one hundred kilograms."
Chapter completed!