With one blow, the zombie's head was smashed open.

A spirit source appeared and quickly shot towards Harry's forehead.

New information appeared in his mind.

"Level 1 Spiritweaver: Spirit Source 9/10"

Harry's heart was filled with excitement, as he only needed one more spirit source.

He let out a low shout and charged forward.

These undead creatures, startled, abandoned the corpse of the one-eyed frog they were gnawing on and rushed towards Harry. Aside from the one whose skull he had just shattered, there were still five left.

Harry secretly calculated in his heart that it was a pity there were too few of these low-level undead creatures, which were not powerful but could provide him with spiritual sources, and he loved them more and more.

His figure flashed, and Harry's eyes captured the attack trajectories of these low-level undead creatures rushing towards him. He easily dodged them and then slammed the hammer in his hand again.

"Bang!" Another undead creature fell in response, and spiritual source appeared in its body, flying towards Harry.

"Level 1 Spiritweaver: Spiritual Source 10/10"

"Got it." Harry was a little excited.

As soon as the spiritual source in his body reached 10/10, a strong surge of heat rushed through his body, followed by a powerful force bursting out.

In that instant, his strength, speed, reaction, sensory organs, and overall physical fitness were greatly improved and strengthened, and even his heart was jumping with joy.

This was an indescribable excitement.

In his mind, one message after another appeared.

"Promotion started, promotion successful"

"Level 2 Spiritweaver: Spiritual Source 0/0"

"Basic Strengthening: Strong Lungs Type 1"

"Special Skill: Peeking Eye Rune (Incomplete)"

"Strengthening selection, upgrade Strong Lungs Type 1, strengthen stomach, strengthen muscles, only one can be selected"

Feeling the surging power in his body, Harry felt that as he upgraded to a Level 2 Spiritweaver, his strength had increased by at least nearly a hundred pounds. If his arms could previously burst with five hundred pounds of strength, now he could burst with no less than six hundred pounds of strength.

Four remaining undead beasts rushed towards Harry, who didn't have time to choose which part to reinforce. He swung his hammer, which, although not long, was made of iron and had a certain weight. Although the weight of the hammer was too light for Harry's current strength, it still had a terrible killing power. As long as it hit, bones would immediately shatter, even the hardest skull would be no exception.

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With one blow, Harry once again shattered the head of a zombie, watched as it fell and the spirit source appeared, fusing into his body, but there was almost no change within him.

As he grew stronger, the changes caused by the spirit source he absorbed became less and less significant. Now, it was almost negligible.

What surprised him the most was that after absorbing the spirit source this time, there was no new prompt message in his mind.

"What's going on?" Harry was slightly taken aback, then proceeded to kill the remaining three zombies, but despite absorbing their spirit sources, there was still no change.

He still lacked 0 spirit sources to evolve again.

"Could it be that I've become a Level Spiritweaver and these zombies are just too low-level, so absorbing their spirit sources is useless?" Harry mused, considering this possibility.

If that was the case, it meant that becoming stronger would be difficult, and he would need to hunt stronger monsters.

"As a Level Spiritweaver, I've gained another enhancement opportunity. Now, there are three options: continue strengthening the Type 1 Strong Lungs, strengthen the stomach, or strengthen the muscles. Which body part should I choose to enhance?"

"The function of Type 1 Strong Lungs is to increase lung capacity, which can prolong breath-holding time by two minutes. If I choose to strengthen this, I should be able to hold my breath longer."

"I just don't know what abilities enhancing the stomach and muscles would give me."

Harry knew that for a city submerged in floodwaters, the duration of breath-holding could be crucial. However, with his increased physical strength, he could hold his breath for at least two minutes, and with the added two minutes from Type 1 Strong Lungs, he could now hold his breath for four minutes.

"Four minutes should be enough for now. Even if I fall into the water, I will have enough time to come up for air. If I can't come up for air after that long, then I'm probably facing something terrifying, and even if I can hold my breath for another minute or two, I'm afraid it'll be more bad than good."

After much consideration, Harry was also curious about enhancing the other two body parts, and ultimately chose to enhance his muscles.

Based on his own guess, enhancing his muscles should be related to strength. Fighting against the one-eyed frog made him realize that strength was the most important factor in hunting stronger enemies.

As he chose to enhance his muscles, new information quickly appeared in his mind, and at the same time, he felt an unusual change in his muscles throughout his body.

"Basic Enhancement Acquired: Muscle Hypertrophy Type 1

"The muscles have been enhanced at a basic level, gaining strength, enhanced muscle control, and increased muscle toughness."

Harry took a deep breath and felt that all the muscles in his body seemed to come alive, like a snake twisting and vibrating. He could visibly see his chest, abs, biceps, thighs, and legs all swelling and bulging, with bursts of strength exploding from these muscles. Not only that, his control over these muscles had increased, and with a thought, he could strengthen these muscles, making them harder and more resistant to attacks.

"It's incredible. All the muscles in my body have been enhanced. I'm afraid my strength has once again increased by about 100 kilograms. Not only has my strength been enhanced, but it seems that I can also control these muscles artificially, making any muscle bulge and harden as I wish. In this state, I can withstand some attacks."

Harry tried to control these muscles, feeling both shocked and happy. Breaking through to become a Level Spiritweaver had increased his strength by about 100 kilograms, and his arm strength had reached 600 kilograms. With the comprehension of "Muscle Hypertrophy Type 1," he gained an additional 100 kilograms of strength, and the strength between his arms could now reach up to 700 kilograms.

700 kilograms, 350 kilograms per arm. For an ordinary office worker like Harry, who didn't exercise much, this was an unimaginable level of strength.

This meant that Harry could now lift five humans with an average weight of 70 kilograms each.

"This spirit source is truly incredible. It can make people so powerful. Moreover, I can become even more powerful, but unfortunately, I now need 20 spirit sources, and the spirit sources obtained by killing these low-level zombies are no longer effective."