More importantly, besides the attribute panel, the Berserker Mark was the only marvel Fang Zhou had discovered that could be shared between his main body and clone.

His main body was on Blue Star, while the clone was far away in the Undead Realm. Despite the countless dimensions separating them, they could share the Berserker Mark through the mysterious link of their shared soul. This undoubtedly proved the mysterious and powerful nature of the soul's essence.

Fang Zhou's Soul Fire pulsed violently. I'm reminded of the quantum entanglement hypothesis, he thought, silently making a note of it. It seems a soul marvel like the Berserker Mark can use this incredibly tight Soul Link to ignore the barriers of space, life, and death. If I could study and master its principles, I might be able to achieve resource sharing between my main body and the clone, which would dramatically accelerate the growth of both.

Deciding to put it to the test, Fang Zhou immediately activated the Berserker Mark within his soul. He used the skeleton clone's subordinate, No.1 Giant Axe, as a medium to summon the Berserker Heroic Spirit, Olaf.

CRACK.

CRACK.

With the consumption of 30 Soul Power, No.1 Giant Axe's previously thin frame quickly bulked up amidst the sound of tearing and growing bone. The two-handed giant axe in its hands transformed into two incredibly sharp Skeleton Battleaxes.

Compared to the Middle Rank Apprentice Heroic Spirit his main body had previously summoned in the cave, Olaf's tier had surged to Black Iron Lower, elevating its combat prowess to a whole new level. In addition to the two White Bone Battleaxes in its hands, its body was now covered in a heavy layer of Bone Armor, just like the skeleton clone.

At that moment, a notification popped up on Fang Zhou's attribute panel.

"Heroic Spirit's strength has increased. A new Berserker Skill Tree is available for selection."

Without a moment's hesitation, he chose the Blood Fury Series for Olaf, a skill tree renowned for its attack power. Upon confirmation, several powerful skills were added to Olaf's skills bar: Bloodthirsty Frenzy, Furious Fury, Blood Blade Tornado, and Reverse Flow Throwing. Each one exuded the unique ferocity and wildness of the Berserker profession.

**[Bloodthirsty Frenzy] (Black Iron-grade, Instinct):** A single-target damage skill. The Berserker's twin axes strike like bloodthirsty beasts, dealing massive damage to a single enemy and restoring a certain amount of its own Life Energy.

**[Furious Fury] (Black Iron-grade, Instinct):** An area-of-effect control skill. Unleashes invisible shockwaves of inner fury to knock back surrounding enemies, causing minor damage and possibly inflicting stun.

**[Blood Blade Tornado] (Black Iron-grade, Instinct):** An area-of-effect damage skill. The spinning twin axes create a whirlwind that deals continuous, multi-hit damage to surrounding enemies, with each hit having a chance to trigger a bleed effect.

**[Reverse Flow Throwing] (Black Iron-grade, Instinct):** A ranged damage skill. Unleashes intense fury to hurl a war axe with astonishing speed and power, dealing massive damage to distant enemies.

Seeing Olaf's new skills, Fang Zhou was secretly impressed. In the Apprentice Stage, when it had only mastered the Golden Body Series skill tree, Olaf's attack power was quite ordinary, making it nothing more than an excellent tank. Now, in the Black Iron Stage, the addition of these Blood Fury Series skills not only greatly enriched Olaf's combat options, but also elevated its overall strength to a new plateau.

In terms of raw combat power, Olaf might have already surpassed my meticulously nurtured skeleton clone, Fang Zhou thought.

To verify Olaf's true strength, Fang Zhou decided to conduct a live combat test. The battlefield was an open area situated between some hills.

The skeleton clone wielded a Refinement +2 bone long spear and was clad in Light Bone Armor that seemed fused to his very frame, giving him a particularly martial appearance. The skills he had mastered included Brutal Strike, Heroic Charge, Weapon Specialization, Block, and Battle Cry—all of which had proven their utility in previous battles.

In contrast, the Berserker Heroic Spirit Olaf was equipped with two sharp White Bone Battleaxes and was clad in a suit of heavy Bone Armor, radiating the unique, savage aura of a Berserker. Its skill list contained both the Blood Fury Series and the Golden Body Series—the two signature skill trees for Berserkers. Although incomplete, every skill hinted at destruction and death, making its arsenal far more impressive than the skeleton clone's.

At Fang Zhou's command, Olaf initiated the attack. It raised its war axe and immediately used Reverse Flow Throwing. The White Bone Battleaxe in its right hand tore through the air with a screech, smashing toward the skeleton clone like a meteor.

However, Fang Zhou was prepared; he wouldn't be taken down so easily.

Heroic Charge, activate!

The explosive burst of speed allowed him to easily evade the astoundingly powerful Reverse Flow Throwing. Immediately after, Fang Zhou used the speed advantage from Heroic Charge to rush directly at Olaf, intending to overwhelm it with lightning speed while it was temporarily disarmed.

However, Olaf simply raised its right hand, and the war axe, which had flown dozens of meters away, reversed its course and flew back as if it had a mind of its own.

The bone long spear drew a sharp arc through the air, aiming straight for Olaf's chest. Olaf crossed its twin axes, effortlessly blocking the strike. The clash of axe blades against the spearhead produced a crisp ring, sending ripples of sound through the air.

Without giving the skeleton clone a moment to react, Olaf immediately launched Bloodthirsty Frenzy. Its twin axes, glowing with a bloodthirsty red light, slashed toward the clone like a whirlwind. Each swing stirred up a bloody tempest, threatening to engulf him.

The skeleton clone rapidly retreated, using the Block skill to mitigate some of the damage. However, Block was merely a universal skill for Apprentice-Tier Combat Professionals and could hardly make a difference in a Black Iron-Tier confrontation.

Left with no other options, Fang Zhou could only rely on his Skeleton Armor—which he had repeatedly enhanced to White (Common) quality using Corpse Essence—to endure the damage from Olaf. Fortunately, after the Skeleton Armament had evolved into Corpse Armor, Fang Zhou's entire skeleton, along with the Skeleton Armor, had been strengthened by the Corpse Essence from zombies. Compared to ordinary Skeleton Warriors, he was far superior at channeling and dispersing force, which allowed him to barely withstand Olaf's ferocious, storm-like assault.

CLANG! CLANG! CLANG!

A series of metallic clashes echoed across the corpse-strewn hills, and scratches appeared on Fang Zhou's Skeleton Armor.

Truth be told, this was the first time the Skeleton Armor's defensive capabilities had been put to the test since the skeleton clone broke through to Black Iron Lower and condensed it. Due to Fang Zhou's usual combat style of bullying the weak and ganging up on his enemies, he had never encountered an undead creature as formidable as Olaf, so the Skeleton Armor had never been needed.

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