Muscle Hypertrophy Type 1 was able to enhance strength by an additional 100 pounds, but now it has been upgraded to Muscle Hypertrophy Type 2, which can enhance strength by up to 300 pounds. This means that in the state of Muscle Hypertrophy Type 2, combined with his basic strength of 700 pounds, Harry can unleash a force of one thousand pounds.

A force of one thousand pounds is unimaginable for the previous Harry.

For the current Harry, the iron rod in his hand is as easy to lift as a withered grass, despite not being light. However, the power of his strikes has increased significantly. With one swing, the head of the Water Rat Beast he hit did not just collapse and shatter, but exploded entirely.

Harry successfully promoted to Level 3 Spiritweaver, while Olivia, with the help of Jackson, also successfully killed two low-level Zombies and became a Level 2 Spiritweaver.

As a Level 2 Spiritweaver, Olivia's body was strengthened, and the most obvious change was that her basic strength had increased a lot. The worse her physical condition was before, the weaker her strength was, and the more obvious the effect of this evolution was. Because Olivia was just a little girl, her physical condition was much worse than Harry and Jackson's, but she gained a greater evolution after obtaining the Spiritual Source. Once promoted to a Level 2 Spiritweaver, her current strength had reached six hundred kilograms.

"Which two choices did you make for strengthening?" Jackson asked, afraid that Olivia would choose randomly.

"Ear and lung," Olivia's answer was simple and her voice was quiet.

"Choose the lungs." Jackson didn't hesitate to let Olivia make the choice, "It's all water outside, so increasing lung capacity is definitely not wrong. I have already strengthened my lungs to Type 3."

Harry looked surprised at Jackson and said, "Why don't you strengthen your muscles to increase strength? Why do you always strengthen your lungs?"

Jackson smirked and said, "Who made me seasick? Besides, the water level is still slowly rising. It's possible that one day all places will be flooded, and we can only live in the water. Then you will know the benefits of strengthening your lungs. Do you know how long I can hold my breath now? Thirteen minutes. That means I can stay in the water for thirteen minutes with just one breath. Do you know what that means?"

"Whales that live in the ocean can hold their breath for about 10 to 30 minutes. I'm even more powerful than some whales with shorter breath-holding times."

Listening to him, Harry was a bit envious. He thought that he could hold his breath for as long as a whale now, and there might be a possibility of living in the water in the future.

But envy aside, if Harry had to choose again, he would still choose to strengthen his muscles.

He had now figured out a rule. With each level-up, his basic strength could increase by about one hundred kilograms. According to this rule, Jackson, who was now at Level 4, had a basic strength of about eight hundred kilograms. In terms of pure strength, Jackson was no longer as strong as he was.

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While the two were discussing, Harry dealt with several Water Rat Beasts that had rushed up, and the number of Spiritual Sources he owned had increased to six, but he still needed twenty-four more Spiritual Sources to level up again.

Perhaps Harry's performance was too terrifying. The staircase was piled up with Water Rat Beast corpses, and the other Water Rat Beasts still alive fled in panic towards downstairs and disappeared into the darkness. They did not continue to rush up.

Harry did not pursue them. Instead, he looked up at the top of the stairs and faintly heard movement coming from the rooftop. "Hey, should we go back and try to deal with that Behemoth Crab?" he said to Jackson.

Now that he had the strength of a thousand kilograms, and his speed and reaction had improved further, and with Jackson now at Level 4, the two of them working together had a good chance of dealing with a Level 3 elite Behemoth Crab.

What Harry was interested in was the special ability obtained from observing the Behemoth Crab through the "Peeking Eye Rune": Behemoth Armor.

The special ability was amazing for improving combat power. Harry could crush monsters of the same level, and even kill higher-level Spiritual Source Beasts. On the one hand, it was because he chose to strengthen his muscles to gain powerful strength, and on the other hand, it was because he had the special abilities of "Fangs of Gluttony" and "Peeking Eye Rune".

"Fangs of Gluttony" was extremely sharp and unstoppable, while "Peeking Eye Rune" allowed him to understand his opponent's strengths and weaknesses, such as when he fought the Leviathan Lizard earlier. He knew through the "Peeking Eye Rune" that the giant lizard was highly poisonous, so he tried to avoid being bitten. If he hadn't known about it, he wouldn't have been prepared, and being bitten by the Leviathan Lizard would have resulted in a completely different outcome.

"Okay." Jackson was also eager to try. He swung his steel shovel at the corridor, knocking two low-level Zombies flying, then turned and ran towards the rooftop stairs.

Harry followed closely behind and said to Olivia, "Follow me and stay at the entrance. You don't need to come out. The Behemoth Crab is more dangerous, and those Water Rat Beasts won't come up. These Zombies can no longer harm you."

Olivia nodded. She was now a Level 2 Spiritweaver and had gained some experience. Dealing with these low-level Zombies was indeed very easy, and she was no longer as panicked and helpless as she was at the beginning.

The three of them went up the stairs, and when Jackson reached the top, he exclaimed, "This guy is really persistent. He's still blocking the way here."

At the exit on the rooftop, the huge Behemoth Crab was still blocking the way and occasionally using its pincers to destroy the exit. The iron door at the exit had been deformed by it.

When Jackson rushed up, the originally weak iron door finally fell off, pushed by the Behemoth Crab's large pincers, and flew towards Jackson who had just rushed up.

There was no way to dodge, so Jackson could only grab the steel shovel with both hands and face the iron door head-on.

"Clang!" With a loud noise, Jackson shook both arms, and the iron door was blocked by the steel shovel, making his arms sore and his teeth gritted. Then he shouted "Hey!" and pushed this twisted and deformed iron door, using it as a shield, and rushed towards the Behemoth Crab at the exit.

The iron door was pushed by Jackson and hit the Behemoth Crab blocking the entrance, making a huge noise. However, the Behemoth Crab was too powerful, and Jackson's push did not completely push it away. Harry followed closely behind, rushing forward and slamming into the iron door with his full power of a thousand kilograms.

"Boom!"

With the two of them working together, they pushed the iron door out, along with the Behemoth Crab that was rolling out.

The Behemoth Crab, which blocked the entrance and exit, was knocked out. Harry and Jackson breathed a sigh of relief, rushed out of the entrance, and returned to the rooftop. According to Harry's instructions, Olivia guarded the entrance, which was relatively safe, and the Behemoth Crab could not attack her. She only needed to deal with the low-level Zombies coming up the stairs.