What he had in mind was a large warhammer that would be held with one hand. The warhammer would also be very heavy so that its physical impact would be powerful on its own.

Ideas flowed through him mind and he eagerly added them to the design he was drawing on the paper.

As he did so, he said to himself, "Even if it were possible to forge a weapon that could grow on its own, making it won't be as easy as this."

What he was designing was just a hammerhead. His design was essentially a cuboid. It was a large cuboid that would be made of mythril.

Mythril is a superalloy of silver. Unlike silver, which is soft, mythril is as hard as tungsten. On the Mohs scale of hardness, silver is ranked 2.5-3.0, while tungsten is ranked 7.5-9.5. This is a difference that translates to hundreds of times in hardness.

Mythril is very expensive, though. It is up to a hundred times more expensive than silver by weight. But it was worth the cost because of its superconductivity attributes.

After making the design, he sent it to Thor to check for mistakes. Thor made some necessary adjustments to the design and also gave him some suggestions.

The adjustments he made increased the structural integrity of the hammerhead, while the suggestion he made was to increase the utility of the hammerhead as a weapon.

Thor suggested that he turn one of the faces of the hammerhead into an axe. This way, the hammer will be capable of cutting too. This won't limit it to blunt damage.

The suggestion was a good idea, so he went with it. But this meant that he had to redesign the whole thing.

After much back-and-forth between him and Thor, they finally settled on a finished product. Thor even took a break from his cultivation to forge the hammer.

Arthur didn't ask him to forge the hammer. Thor wanted to do so. All he asked for in return was for Arthur to let him examine the finished product.

Arthur agreed to the deal and sent over the mythril through Roar. A day later, Roar brought back a heavy box containing a shiny black hammer.

The hammer was so gray that it was black. Yet it shone with a glint as if it were glass or obsidian. Arthur liked it as soon as he laid his eyes on it.

He quickly took the hammer from the box and inspected it.

The whole hammer weighed 11 tons. The hammerhead had a cuboid middle. One of the two faces was an axe, while the other was a round ball with a spiked surface.

The axe face was for cutting, while the other face was for piercing and crushing. The external foundation would reside in the cuboid in the middle of the two faces. But first, it must be engraved with a lot of formations.

The formations he planned would involve the engraving for energy enhancement, energy discharge, heavy, sharp, clean, energy displacement, and many others.

The engraving for heavy would make the weapon heavier. The engraving for sharp will make the axe face cut deeper and the spiked face pierce deeper. Then the engraving for "clean" will keep the hammer spotless and free from blood.

All of these engravings will rely on the engraving of energy enhancement. This part is normal. The abnormal part of his weapon is that the energy won't come from him.

The energy that will be used to enhance the power of the hammer will come from the external foundation within it. This energy can also be released in a singular and violent outburst through the engraving of energy discharge.

Energy displacement is a tamed version of energy discharge. Energy is still discharged from the weapon when energy displacement is used, but the discharged energy is more subdued, is controllable, and can be released for longer periods of time, so it is sustainable.

Engraving one property on a weapon is very easy. It is something novices can do.

He managed to enchant a weapon on his first day of learning formations. His enhancement was crude and temporary, but it was still something he could do easily.

However, engraving more than one property on a weapon is not for novices. No matter how crude the individual engravings are, they will interact with each other on the same weapon.

When engravings interact with each other, they might interfere with the operation of each other, which can lead to destruction or reduced power. This is where the difficulty lies.

In fact, the more crude each engraving is, the easier it is for them to interfere with each other and cause destruction. This is why novices can't succeed in enchanting a weapon with multiple engravings.

For one to engrave more than one formation on a weapon, each engraving will have to be impeccable and resistant to interference and also isolated as much as possible so that they will not interfere with other engravings.

This is the basic requirement for multiple enchantments on a single weapon. But for advanced formation masters like him, he can make the individual formations interfere with each other for the sole purpose of making them enhance each other.

Formation masters that are proficient in their art can make individual engravings that are isolated from each other and thus, don't interfere with each other. But experts like him do the opposite.

It is a matter of skill. Without enough skill, intentionally making individual formations interact with each other can only end badly. The backlash of the attempt will be even worse than the backlash of a novice trying to enhance the same weapon with multiple formations.

But he was confident in his skill and believed that he could do it. Besides the matter of confidence, he believed that he must do it because the next stage after intentionally making individual engravings work together is shrinking multiple formations and combining them in the same item to form a formation treasure.