In theory, combat techniques, whether battle energy or death energy, are universal.

Of course, this is just in theory. In reality, most combat techniques have many variations and differences when using battle energy and death energy.

Only a few combat techniques can be completely universal in both.

However, Fang Ka doesn't mind. If they can be completely universal, then players are lucky, just let them use it.

If they can't be completely universal and have many differences, then let the players tinker with them themselves.

You can't doubt the creativity and research ability of players; they will definitely be able to adapt it to themselves. It's just a matter of time at most.

As for the death energy auxiliary potion, this was something Kain developed while he was still alive.

When Kain was experimenting, he discovered that the undead skeletons he created reached a high tier and generated death energy, they needed to follow the normal advancement path, starting from death energy.

So he came up with such a potion. As long as you pour it on the crown of the head while practicing death energy, it can speed up the refinement of death energy to a certain extent.

It's somewhat similar to a magic array assisting meditation.

However, the cost of this is certainly not as low as a magic array.

Because many of the materials needed for this potion are hard to find.

On the island, only some of the materials are available, so Fang Ka couldn't refine it, and the existing potion has only a few hundred portions, which were collectibles that Kain spent a lot of time and effort on.

This is also why Fang Ka priced it so high.

Because for now, this thing is inherently a non-renewable luxury item.

Actually, if players want rapid progress with death energy, there's a simpler and more direct method.

Killing knights with battle energy.

Knights with battle energy, upon death, have a special power dispersed from their vital acupoints, referred to as Knight Origin.

When this special power is dispersed, if there are undead creatures with death energy nearby, it will be directly absorbed by the undead creature, increasing the death energy within the undead creature.

Generally speaking, the higher the power level of the knight, the stronger this special power in the vital acupoint, and the higher the enhancement it can provide to undead creatures.

In this regard, the special undead creatures Kain developed are actually no different from those from the Netherworld.

And this is also one of the reasons why so many factions despise necromancers.

Because many necromancers summon undead creatures from the Netherworld and target the knights of various factions.

The most important part is that this thing is one-directional, not bidirectional, meaning that when undead creatures die, this special power does not disperse from the demon cave.

Thus, undead creatures generally won't kill each other.

And more importantly, the special power dispersed from a knight's vital acupoint upon death cannot be absorbed by other knights.

Only undead creatures with death energy can absorb it.

This undoubtedly makes many knights both hateful and envious. If there were indeed shortcuts, many knights would take them.

Fang Ka once asked Kain why this was the case, and Kain's answer was that he had researched this, mainly due to two reasons.

One aspect is the physical constitution of normal living beings, and the other is the rules involving the Netherworld and the demon cave.

This area is very profound, but Fang Ka couldn't be bothered to delve into it.

At this moment, Grandpa Qian of Bone-Touching had come to his senses.

After bidding farewell to Fang Ka, he hurried to the third underground level.

Grandpa Qian of Bone-Touching arrived near the magic crystal vein on the third underground level. The players were still busy mining magic crystals, not noticing Grandpa Qian of Bone-Touching's arrival.

Grandpa Qian of Bone-Touching immediately went to the spot with the most players and said, "Everyone, I've already upgraded the Skeleton Warrior class to advanced."

"After reaching advanced, the class undergoes a qualitative change. Let me demonstrate."

Grandpa Qian of Bone-Touching's words suddenly attracted quite a few players' attention. Many people stopped what they were doing and looked at him curiously.

Grandpa Qian of Bone-Touching raised his hand, then a layer of black death energy entwined his arm, and he swung it fiercely.

In the next instant, the black death energy, like a sharp blade, directly sliced a stone not far away in half.

Seeing this, the surrounding players were momentarily stunned.

Iron Black Pot was the first to react, incredulously approaching Grandpa Qian of Bone-Touching, and asked in surprise, "Wow? Our Skeleton Warrior class, after upgrading to advanced, actually has long-range attack capability?"

Grandpa Qian of Bone-Touching glanced at Iron Black Pot: "Yes, I found that besides magic power, my game panel now has a brand-new death energy."

"This thing should appear after the advanced evolution of the Skeleton Warrior class."

"And it's very easy and convenient to use, completely unlike magic which is so complex."

Iron Black Pot couldn't help but clap his hands: "Damn, I was just planning to save up for a house, but with the advanced Skeleton Warrior being so cool, why buy a house?"

After saying that, Iron Black Pot immediately pulled the Caged Parrot next to him aside for a whisper.

After they finished talking, they immediately resumed mining.

Sea Flip curiously glanced at Iron Black Pot: "Black Pot, are you planning to go enhance your class now?"

"You're not really going to give up on your house-buying plans just because that death energy is so cool, right? With your current savings, you shouldn't need too much time to buy the house you want, right?"

Iron Black Pot gently nodded: "Yes, I discussed it with Parrot, and we've both decided to enhance our class first."

"With the usual pattern, now that someone has advanced to a high-tier Skeleton Warrior, and the class change is so significant, I'm afraid the game will have some major changes."

"I'm worried I won't catch up. If there's any special quest that I miss, it would be awful."

"Regarding the house, the one I like is indeed tempting, but a house is something you can choose, while if a time-limited quest appears and your power level isn't up to par, it's going to be tough."

"At least that's what I decided. If all the good spots in the Underground City are bought out, then I'll just buy one on Newbie Island at that point."

"And I think there's a high chance new scenarios will open up in the future. If nothing else works, I'll wait it out and buy a new house then."

"Yes! I choose to wait."

Once the mining cart was full, Iron Black Pot and Caged Parrot immediately pushed the cart towards the first underground level.

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