Since this helped a few people I'll continue with it. Go read part 1 to better understand part 2 and a few things I forgot to mention in part 1. When a person enters the refinement realm their perception of danger increases which is a major ability. A person's real world body has to be in very good physical shape to even begin in entering the realm. Also a refinement realm expert can defeat a player who's attributes are 30% higher then theirs. This gap increases the more a person progresses through the realms. Without overwhelming strength or a lot of people defeating one refinement realm expert is nearly impossible. That's why these experts can single handily change the tide of war.
3rd level The Void Realm. Void realm experts are more commonly known as peak experts because they stand at the peak of the gaming world. (Phrases like peak and apex experts refer more to the strength of a person in a specific group of people or organizations. In a First Rate Guild a regular refinement realm expert is considered a peak expert but in Second Rate Guild they might be an apex expert. Superpowers that stand at the top of the gaming world will only consider void realm experts peak experts so that is the standard.)
When somebody reaches the void realm they can push their five senses to the very limit. That means a void realm expert doesn't have to rely on their eyes they can perceive the world around them with just their sense of hearing or touch or smell, etc. this allows them to feel very close to their environment and have no blind spots. For all my Naruto fans out there, it's like having a byakugan. Void realm experts can also use their surroundings to their advantage much better than others. Once in the void realm you can see the general attack trajectories of an attack with a glance letting you dodge or block as you see fit. (Everyone is capable of seeing these attack trajectories but a void realm expert has a much clearer understanding of it and doesn't need a stronger physique or attributes to see it for people stronger than them).
A flowing water realm expert can also see their opponent's attack trajectories but it's not difficult for those who are stronger than them to prevent a flowing water realm expert from seeing it and they can only see it for a few people at most. These void realm experts can see the attack trajectories of dozens maybe hundreds of people effortlessly, they can also predict these dozens of people's future actions as well, while flowing water realm experts are limited to three or five people at a time. This is why a void realm expert can fight an army by themselves. Their dodging, maneuverability, attacking, and ability to use their environments is on a level that normal people can never reach. This is why it is possible for a ordinary expert to defeat a refinement or Flowing water realm expert with their combat techniques but not a void realm expert.
But what makes a void realm expert so powerful is their ability to learn and understand. In the God's Domain if players want to learn a combat technique, their game characters need the proper physique and mental power or it will take a very long time and large amounts of effort. Void realm experts can learn almost any combat technique even with out having their game characters be strong enough to do it. They can also grasp new concepts on the spot and have epiphanies which will improve their strength drastically. (For example Shi Feng who was in the void realm had figured out and entered the truth realm in a few seconds after observing a flowing water realm expert display some concepts of the truth realm. That flowing water realm expert had spent days researching and practicing the truth realm concepts and principles but still couldn't enter it. Yi Loufei and Yan Tianxing, a void and domain realm expert had reached the ascension realm before any other Zero Wing member despite starting their realms of truth training much later than these Zero Wing players.) this ability to have an epiphany and how much they can gain from it is different for each void realm expert. Void realm experts can also use their talents that are unrelated to the realms refinement to challenge domain realm experts with similar attributes.
Void realm experts have almost no weaknesses. Only somebody with higher combat standards can can escape their perception and land hits on them. They also only have a fundamental control of their environment. If their surroundings are to complex and they have to deal with to many complex or very precise attacks their void realm senses may not be able to handle it and that is a maybe.
Progressing through the void realm is the second most difficult realm to progress through. At this level it's not entirely about unlocking more of your brain capacity but you also need to understand your body and the concept of body control to better improve yourself. When a person progresses through the void realm, their five sense become sharper and more refined. They will also need less effort and concentration to perceive their surroundings and can focus that effort on their own bodies. They can also perceive their environment better. Someone at the peak of the void realm can clearly notice an ant that is behind them and in the corner of the room while a rookie void realm expert will just know that there is something in that corner but not know what it is, or they will unconsciously ignore it.
The difference in strength between void realm experts are huge, much bigger than flowing water realm experts. Someone who just entered the void realm can easily lose to someone in the middle stages of the void realm. A veteran void realm expert can challenge a domain realm expert and they wouldn't need some talent outside of the realms of refinement to do so.
Being half a step into the void realm means you can already push your five senses to their limits but you don't have rudimentary control over your environment like normal void realm experts do.
4th level The Domain Realm. The Domain realm is the apex of the gaming world. Reaching the Domain Realm means surpassing human limits and becoming a monster. A domain realm expert can basically do everything a void realm expert can do but much better. Their ability to learn and understand new things is at a ridiculous level. (The fact that it takes a domain realm expert a long time to master the God's Domain combat techniques goes to show how complex these techniques are). A domain realm expert has absolute control of the environment in their domain unlike void realm experts who have rudimentary control of their environment. A domain realm expert senses are so powerful that they can notice if someone even takes a peek in their direction from a long distance. They can predict a person's future actions based of that person's muscle twitches and breathing. Their ability to multitask is inhuman. Because of their ability to multitask one domain realm expert can fight multiple domain realm experts at the same time. They are the only people capable of fighting multiple people in the same realm at once, with equal attributes and stuff. Even with equal attributes and stuff, Not even a void realm expert can fight two or more void realm experts at the same time. Domain realm experts can use their skills and spells with 100% efficiency or more.
Domain realm experts don't have any weaknesses. The only way to reliably defeat a domain realm expert is to just be stronger than them and that is to defeat them, trying to kill a domain realm expert is a completely different story. Not even another domain realm expert can reliably kill a domain realm expert by themselves. Only absolute overwhelming strength can kill a domain realm expert.
Every stage in the domain realm is huge. After reaching the Domain realm it is very difficult to improve further. Most younger domain realm experts will never pass the first stages of the domain realm till they become middle age or old. Old monsters are still searching for methods to grow stronger. But while the gap between domain realm experts is huge just being in the domain realm makes a person near invincible. Someone who just entered the domain realm might not be able to defeat someone at the peak of the domain realm but they might not necessarily lose either.
Being half a step into the domain realm means that your techniques and mastery of them are at the level were it can threaten real domain realm experts. You do not have the body control or mental power real domain realm experts have.
Progressing through the realms of refinement is a process that is supposed to take years and years and trying to enter the realms of refinement is almost impossible for most people. Most people will never reach the refinement realm. Most refinement realm experts will stay in the refinement realm for decades. Most flowing water realm experts will never reach the void realm. Most void realm experts will never reach the domain realm.
God's Domain has created a platform to give people an opportunity to enter these realms by keeping their brains constantly active. The younger you start your realms of refinement training the easier it is to enter it. And you must take care of your body and be in very good shape at a young age. That's why most people who start trying to take care of their body and start training in their late 20s greatly decreases the chances of reaching the realms of refinement.
S rank nutrient fluids is a great help when trying to nurture refinement realm experts. Life elixirs can even help Domain Realm experts improve which is something S rank nutrient fluids can't do very well. But these types of resources are very difficult to obtain.
(Life elixirs were such a great help to Shi Feng that he managed to progress far into the domain realm in just a few weeks despite his age and lack of systematic training. That is not normal in the gaming world)
I'll explain the realms of truth next. Hoped this helps.