A few hours later.

[Rock Wall skill level up, Spirit +0.1]

[Rock Wall: Level 2 (1/130)]

Duke looked at the feedback from the Skill Tree; now the secondary magic only brings him 0.1 Spirit when upgraded.

This indicates that he's nearing the limit of secondary magic, and afterwards, he'll probably only be able to gain free attribute points.

"Level 1 Magic..."

Duke was well aware that, to continue gaining Spirit through skill level upgrades, he would most likely have to rely on higher-level Level 1 Magic.

He then started to absorb some of the knowledge from the Rock Wall upgrade.

What Duke found strange was that the feedback was all related to using yellow sand to cast magic.

Perhaps because he continually practiced in this way, the Skill Tree fed back related information.

After studying this knowledge for a while, Duke suddenly had some new ideas.

Most of the magic he had mastered so far was defensive in nature, lacking offensive magic.

The knowledge just fed back by the Skill Tree gave him some new inspiration.

With the Gravity Slowdown's Gravity Manipulation feature, if he combined the abilities of Gravity Manipulation with the Rock Wall skill, maybe he could produce some new effects.

Once he had the idea, he quickly began researching.

Duke took out the magic model of Gravity Slowdown and the Rock Wall magic model, along with the knowledge he had gained over this period.

An idea was gradually forming in his mind, and he realized it was a new spell.

Creating new magic is not uncommon, even Wizard Apprentices often manage to create some new spells.

Generally, Wizard Apprentices with a bit of talent, after accumulating enough knowledge and having sufficient thought and experimentation experience, often reach this point.

The key lies in whether the created magic can have a good effect and provide significant practical value; this is the most crucial aspect.

Countless spells have been born since ancient times; even just secondary magic numbers are probably uncountable.

But most Wizard Apprentices still use the common ones because the spells must be effective.

Many spells endure the test of time, becoming more suitable for most people, with relatively fewer drawbacks, hence becoming more widely used.

While many spells are novel, due to their drawbacks, they often lack practicality or are easy to counter, so fewer people use them.

Duke planned to design a unique spell based on his specific situation.

With the Yellow Sand Crystal and Gravity Slowdown's Gravity Manipulation feature, he could tailor-make a spell for himself.

Duke quickly began calculating and designing, and sketched a preliminary magic model.

This magic model was crude, so Duke conducted some experiments, continuously adjusting and refining it based on experimental data.

In the laboratory, a lot of yellow sand floated around Duke, and suddenly converged into a fist-sized ball, as if something was attracting them.

"Adjusting the direction of gravity is finally done!"

Duke sighed in relief at this sight; previously, the gravity he cast was based on the Earth, with the direction of gravity pointing downward.

After numerous tests and attempts, he finally managed to adjust the direction of gravity.

The yellow sand is centered around a point in the air, attracted by gravity from this point, continually converging towards it, as if forming a small planet.

For a moment, Duke even had the illusion of creation, as if a planet was slowly taking shape under his control.

This was a preliminary effect of his idea, with much more content needing testing and experimentation.

Over the following days, Duke immersed himself in the lab, experimenting tirelessly.

The sense of accomplishment of getting closer to his goal made him reluctant to stop, occasionally grabbing a bite of dry provisions and then continuing the experiments.

Three days later.

A large amount of yellow sand floated in front of Duke, and he extended his hand, the sand immediately converged into a mass forming a human hand, and then squeezed fiercely.

The tranquil laboratory erupted with a muffled sound, emanating from within the mass of sand.

Countless grains of sand pressed against the center, exerting enormous pressure.

If someone were inside, they'd likely be crushed by this force, leaving broken bones and becoming a heap of mud.

This was the spell Duke wanted to create; in his conception, he could eventually manipulate surrounding mountains and earth to seal enemies inside, crushing them.

However, this level is currently unattainable; a secondary spell alone cannot achieve this, and Duke's own Spiritual Power and Magic Power cannot support such feats.

Still, Duke was quite satisfied with his progress, naming the spell Gravity Yellow Sand.

The corresponding branch for this skill appeared on the Skill Tree, proving the spell was indeed created successfully.

[Gravity Yellow Sand: Level 1 (1/100)]

Duke looked at his pile of experimental data; currently, Gravity Yellow Sand's strength can reach up to 23 degrees.

The strength of this spell is related to the amount of Magic Power he infuses and the inherent strength of the sand.

Twenty-three degrees is Duke's current maximum limit, typically around sixteen or seventeen degrees in regular use.

Among Duke's current spell arsenal, this doesn't count as very strong.

But in the realm of general secondary spells, this strength is already quite good.

It's through his own Gravity Manipulation feature, incorporating part of the Gravity Slowdown structure into the magic model, that Duke achieved this effect.

Even if others obtain this magic model, they cannot replicate Duke's result; even the basic step of changing gravity direction would be impossible.

Because they lack the Gravity Manipulation feature.

Duke also tried Three-headed Dog saliva to strengthen the sand but found the Yellow Sand Crystal doesn't absorb this substance, preferring the metal type instead.

He plans to buy some Magic Metals when he has enough resources, to strengthen several tons of sand, which should be sufficient for some time.

Duke stood on a mass of sand, slowly lifted himself into the air, floating mid-air.

This was a clever application of his abilities, achieving this effect, essentially lifting himself up.

In the laboratory, yellow sand swirled, occasionally condensing into a sphere, sometimes transforming into a giant hand, and other times forming a solid wall.

Duke knew the spell was still just a prototype and needed continual refinement.

His mind is full of ideas, yet most are unachievable with secondary spells.

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