The "Peeking Eye Rune" appeared on his forehead, and a piece of information appeared in his mind.

"Name: Advanced Zombie, a powerful Zombie evolved from a low-level Zombie. In addition to the instincts of a low-level Zombie, it also has a certain amount of intelligence. Each type of advanced Zombie has a special ability evolved from its evolution and has a certain probability of evolving into an undead."

Suddenly, from the dark corner of the hallway, an advanced Zombie appeared. Unlike the Zombie that evolved a third hand earlier, this advanced Zombie had evolved a bone knife in its right arm.

This bone knife is over one foot long and protrudes from the muscles on the outside of the right arm. It is extremely sharp. It used this bone knife to cut Jackson's chest just now, leaving a deep wound. It almost cut him open from chest to stomach.

If it weren't for Harry's reminder, Jackson instinctively retreated. Otherwise, this blow would have cut his upper body completely, and he would have died instantly.

Blood gushed from Jackson's chest, and he screamed in pain and stepped back. Harry angrily shouted and swung his iron rod.

"Clang!" The advanced zombie raised its left arm and blocked the iron rod, and the bone in its arm immediately shattered from the force of the strike. But for zombies, except for the fatal weakness in their heads, they can't be killed by any severe injury.

The advanced zombie sacrificed its left arm to block Harry's iron rod and swung its right arm from bottom to top. The sharp bone knife followed suit and attacked Harry unpredictably. Harry gasped in shock.

He had just used all his strength to save Jackson, and his body was leaning forward at this moment. He was too late to retreat, and he saw the bone knife slicing him from his abdomen to his chest, which was a fatal wound that even the healing power of the Spiritual Source could not heal.

At this moment, it was too late to withdraw the iron rod and block the attack. Harry could only take a risk and swing his left hand down to activate the "Fangs of Gluttony" to block the attack.

In the darkness, the bone knife was too fast. If he made even a slight mistake, Harry's left hand, or even his left arm, would be gone.

"Clang!" Four "Fangs of Gluttony" narrowly blocked the bone knife from above. Despite this, Harry still felt a slight chill in his abdomen. The tip of the bone knife was stuck in his abdomen about one or two centimeters deep. Harry immediately lifted his leg and kicked the advanced zombie out with a loud bang.

Watching the advanced zombie tumbling away, Harry's back was covered in cold sweat. The change just now was too dangerous, and he felt like he had just returned from the brink of death.

This kind of advanced zombie was really terrifying, even more difficult to deal with than a third-level Leviathan Lizard.

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Jackson, who was injured in the chest, covered his wound with his left hand and roared. He held a steel shovel and stabbed it at the advanced zombie that Harry kicked away.

The advanced zombie fell to the ground and immediately rolled on the ground. The steel shovel hit the ground, and sparks flew out in the piercing sound. It was clear that Jackson used all his strength in this angry attack.

Harry also followed closely behind, and his iron rod struck the rolling advanced zombie.

"Clang clang!" The advanced zombie raised the bone knife on the outside of its right arm to block Harry's iron rod. Jackson's steel shovel missed and hit the ground. He immediately followed up by sweeping horizontally and hitting the advanced zombie's right shoulder with a loud "snap" of bone breaking.

The bone in his right shoulder shattered, causing the advanced Zombie's right arm to instantly lose strength and hang down. Harry took a step forward and extended his left hand, plunging the "Fangs of Gluttony" into the Zombie's face, cutting four deep grooves into its features.

The fluffy white hair on the face of this advanced Zombie retracted and disappeared, and soon a Spiritual Source emerged from its face, flew swiftly towards Harry's forehead, and entered it.

His whole body was enveloped in a warm stream, and the injured areas were wrapped in this warm flow, accelerating the healing of his wounds.

Harry took a deep breath, and with this Spiritual Source, he now only lacked three more to successfully advance.

There was a sound coming from the corridor in front of them, and a group of Zombies were swaying towards them.

Harry activated the "Peeking Eye Rune" to observe, fortunately, they were all low-level Zombies. Otherwise, if a group of advanced Zombies appeared, it would be troublesome.

"I need two more, Harry, how about you?" Jackson turned his head while gasping for breath, and suddenly heard that several Water Rat Beasts were rushing up from below.

"Olivia, these low-level corpses are for you." Harry thought that Olivia was already a level 1 Spiritweaver, with at least five hundred pounds of strength. With the speed, strength, and reaction ability that a level 1 Spiritweaver should possess, even though she was only a thirteen-year-old girl, dealing with these lowest-level Zombies wasn't difficult.

Olivia, hearing Harry's words, nervously gripped her hammer and ran down to Harry's side.

Harry turned around and followed Jackson to deal with the Water Rat Beasts that were rushing up from the other side of the stairs.

Jackson had already succeeded ahead of him. Although he was badly injured with blood flowing from his chest, he still had no difficulty dealing with the Water Rat Beast. He aimed at one that was pouncing towards him, and his shovel struck down fiercely, knocking the Water Rat Beast to the ground with its head caved in. A Spiritual Source immediately entered his forehead.

With the acquisition of the Spiritual Source, Jackson's wounds immediately healed at a visible speed, and he was invigorated. "Only one left!" He leaped forward towards the other Water Rat Beast that was charging at him.

At the same moment, Harry killed another Water Rat Beast, receiving another Spiritual Source. He was now only two Spiritual Sources away from a breakthrough. However, the group of Zombies in the corridor behind them was already rushing towards them. The fastest Zombie had arrived in front of Olivia.

Olivia was facing a Zombie alone for the first time, and was nervous. When she saw the Zombie rushing towards her, she instinctively retreated instead of attacking.

Harry had been observing her all along. When he saw this, he sighed secretly and quickly turned around to come to Olivia's back. He swung his iron rod and broke the arm of the Zombie that was reaching out towards Olivia. He then spoke in a low voice, "Quick!"

Hearing Harry's voice, Olivia was emboldened. She tightly gripped her hammer and struck it towards the Zombie's head.

There was a "bang" as the hammer accurately hit the head of the low-level Zombie, which was no small feat with her current strength. The Zombie's head was immediately smashed, and a Spiritual Source entered Olivia's mind. She received a message in her mind.