[After diligent training, Doushen Jue has been elevated to the nineteenth level, with a slight increase in Spiritual Power]

Consuming 1 million experience points.

[After diligent training, Doushen Jue has been elevated to the twentieth level, with a moderate increase in Spiritual Power and Soul Strength]

[Doushen Jue has reached the twentieth level, acquiring a new skill—Mental Mark]

[Mental Mark: Leave a mental mark on any target. When the target approaches the skill user, the user can sense the marker's location, allowing the user to observe the marker's status through the mark]

[Note: Mental Mark is an extension skill of Doushen Jue, non-upgradable, and its effect depends on the level of Doushen Jue. Current number of marks: 0/20]

"Mental Mark, it seems like an interesting skill." Lu Yu thought upon seeing the new skill's function.

But there was nowhere to experiment with the new skill now. After Doushen Jue was elevated to the twentieth level, he found himself in a state of excitement, desperately wanting to divert his mental energy to avoid over-excitement.

Thus, he began calculating his complex and challenging muscle equations.

Three days later, Lu Yu finally resolved all the issues. During this time, he observed changes in his muscle lines by attempting various actions, most being ones encountered in daily life, while a few exceeded normal human abilities.

He tried them all, discovering that most muscle positions hadn't changed significantly, especially relative to surrounding muscles.

However, forming a Golden Armor Spirit Array on a plane with all the muscle lines proved difficult, so he devised a three-dimensional Golden Armor Spirit Array.

No longer confined to a plane, the three-dimensional Golden Armor Spirit Array was much more complex than its planar counterpart, yet it also contained many backup patterns, or substitute patterns.

These patterns typically resided within the Golden Armor Spirit Array's range, sharing its enhancements. Although they seemed related, damages to substitute patterns wouldn't disrupt the Golden Armor Spirit Array.

Moreover, when issues arose in the main patterns, the substitute patterns served as replacements, minimizing the unexpected breakdowns of the Golden Armor Spirit Array as much as possible.

After resolving the equation for the Golden Armor Spirit Array lines, Lu Yu began programming the array, controlling each muscle to change form to the desired shape.

One by one, the muscles changed, gradually forming the pattern of the Golden Armor Spirit Array inside Lu Yu's body.

When all the muscles completed changing according to the Golden Armor Spirit Array's equation, Lu Yu appeared somewhat rigid.

He lay motionless on the ground as Spiritual Power flooded into his muscles, filling the muscle lines.

Once the muscle lines were fully filled, complex-looking patterns emerged within Lu Yu's body.

Lu Yu slowly relaxed his muscles, and the patterns began changing, with the lines existing stably without collapsing.

When Lu Yu's muscles returned to their original form upon relaxing, there were no signs of damage to the Golden Armor Spirit Array within him.

He sighed in relief, suddenly clenched his fist, internally shouting, "Succeeded!"

As he made this gesture, his heart instinctively skipped, fearing that suddenly clenching his fist might break the Golden Armor Spirit Array; fortunately, it did not.

He stood up, moving his body to test the array's stability. The Golden Armor Spirit Array, built from his flesh and blood, maintained stable operation, with certain muscle lines continually serving as array patterns to strengthen other muscles' defenses without any incidents.

"This truly is amazing." Lu Yu stood, pressing his fingernail into his skin, able to feel the firm muscles beneath.

It used to be like firm cowhide over silicone, but now it felt like firm cowhide over a solid stone.

Though both are "silicons," their properties greatly differ.

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