I'm only going to give feedback over the first few episodes and the most recent if that's alright. I can be blunt and harsh, but thorough, so if that's not what want to hear skip to the end for the overview.
The blunt but in-depth bit
The first thing that sticks out to me is how flatly written the blurb is. Not only is story seemingly little cliché (something that's understandably hard to overcome when writing fantasy for the first time), but it's also written in passive voice.
"In a world filled with magic, dragons, and unimaginable occurrences, lives Chaus. <--- this sentence would have been a great opportunuty to explain a little bit about the character, how old he is, what race, meaning fantasy race, he is, etc. Chaus was living a peaceful life in his village What's the name of his village?, but one night, Chaus's entire village was massacred. <--- I think the issue with this line, at least for me, is that it doesn't mention anyone important to Chais, like family or friends, or, on the other end, it doesn't mention who massacured the village. No one was left alive except for Chaus. <---This line is redundant. A mysterious creature takes Chaus in and decides to teach Chaus. Chaus beings his journey to take revenge on those that slaughtered his village, but along the way, he encounters a much more terrifying truth. Filled with beautiful love, uncontrollable vengeance, heaven shattering power, and unexpected twists, this is Chaus: Dawn of a New Age."_
The rest of the blurb is pretty okay, it's just that things are pretty vague and distant, meaning there's not much to intrigue the reader into choosing this book over others. Also, there are a few typos in there as well that might also deter some potential readers. It sounds like it could be interesting, however.
Episode 1
I'm going to be honest, you already lost me in the first three paragraphs. Not lost in terms of confusion, but in terms of enjoyment. You start with the massacre having happened and then quickly cut to thirty minutes prior without building any tension.
The first paragraph fine, but suffers from passive voice so it doesn't flow as well. The second paragraph which focused on Chaus should have been expanded on to build suspense. Introduce an assailant that's walking around the room Chaus is under and his close to finding him. Explain more about how Chaus is reacting physiologically: his shallow breaths, his beating heart, his trembling hands. Really get into how he's feeling so when you cut away from that scene, your readers are left wanting to go back and to see the outcome.
You use a lot of filler words like in the sentence, "Richard came over and also started hugging Chaus"
Instead of "started hugging", you could just say hugged. Or if you don't want to use the same word: squeezed, embraced, and enveloped are all better options that would have given some emotion to the scene.
And also there's a flatness and nondescript aspect to your writing. You don't go into detail about locations or how characters are feeling. We know the name of the kingdom, but not the village. We don't know what the village looks like, if the streets are bustling and filled with "vitality". The writing comes off as generic and uninteresting because nothing is explained that would set it apart.
"Chaus went straight to his hiding spot with a smile. Soon he would be able to eat his favorite desert." Are a bit of a redundant pair of lines, and you're missing a comma after the Soon.
There's a repetitiveness in your diction, word choice, and syntax, sentence structure. You keep reusing Soon at the start of your sentences, so they all blend together. And repetitive sentences are boring sentences, your not keeping your readers on their toes. This episode was supposed to be sad and suspenseful and dramatic, but in my opinion it was none of those things. We don't spend any time getting to know the village or Chaus's parents so when they die, it's not meaningful to the readers. You can only sympathize with someone, or a character, you don't know so far. Keep this in mind going forward, if you want your audience to feel bad for a character, you need to establish them first.
Episode 2
Why "Sharp, jagged teeth could be seen in the creature's mouth"?
Why not: "Sharp jagged teeth protruded out of the creature's cave like mouth and hung over its bottom jaw like stalactites."
I realize that only so many expectations can be had when being new at writing, or to any skill, but I think diction and syntax are the biggest things to focus on for you. I can only say so much on what is written, the story, but the way everything is written so, not bad, but flat and uninteresting. If there is something beneath the surface of this plot, it's hard to tell if your writing style would be able to bring it forward.
Another thing the flat descriptions are indicating that you are prone to telling the reader things rather than showing the reader things. There will always be a time for telling, there are things that just need to be explained to your reader. As a rule of thumb, the emotions of major characters should be shown. You get away with saying something short about the feelings of the one off or unimportant characters, but if we're going to be spending any time with them, we better know how they feel/react to things. Descriptions are also showing the readers things, as opposed to telling them. It's a matter of striking a balance.
Chaus's reaction to the confirmation that his entire village is dead and that he will never go home or see his parents again is really... cold. Especially for a nine-year-old who was seemingly attached to his parents. Not a single tear, a dry heave, A GASP?! Does he care? And you might say, "Oh well he's going to avenge his parents and fight some Zikis." Okay... Maybe he cares enough to be mad, but not enough to be sad? He's not even desperate to go back to see his parents again or try find the Ziki as he is to get revenge. It's so calculating and boring because YOU DON"T WRITE ANY EMOTION INTO THE SCENE! Should I even feel bad for the nine-year-old who lost his whole village? That is a question you don't want your readers to ask!
The paragraph where Dru transported Chaus into the room of fire was pretty good. Unfortunately, it is followed by a big unbroken paragraph of exposition. Again, there will always be space for telling the reader things, but if you are giving a lot of information, break up the dialogue with narrative, another character speaking, or literally formatting all the text into the separate paragraphs. Another problem with the exposition paragraph is that, it introduces things and explains them, like the multiple stages (which don't seem to be important right now. Why wouldn't you leave the rest past the first one to be explained when it's relevant?), but also introduces other things, like magi (singular magus) without explaining what those are. I know they mean magician or wizard, but the uninitiated will not. So, be careful about what you're explaining.
You say in this line. "Chaus wanted to give up and leave this hell, but if he did, he could never face his dead family or village."
But why though? I mean, I know why, but you haven't explained that to me over the course of these two episodes. He made no promises to his family or himself. He's nine! What are they expecting out of him? What's he expecting out of himself? Chaus doesn't read like a nine-year-old. He does a little at the start, but throughout the second episode, he sounding more and more like an older teenager or young adult.
Hooray! another paragraph of seemingly irrelevant exposition. I'm not saying the information about the stages is unimportant, it's just a lot of info all at once without much connection to the narrative. You're better off explain what the stages of each thing are when and if Chaus reaches them. And you use the same descriptor, "stage", to describe the different levels of soul formation and Hellfire. That's super confusing as a reader to separate, especially when those paragraph are so close to one another, so I recommend changing one of them to something else: phase, degree, and level are all good options.
It's kinda unfortunate that these stages that Chaus needs to pass through occur so quickly without much struggle. I mean he does struggle, but it's very much glanced over. The concept is introduced within the same episode that he surpasses two of them. Make of that what you will...
Episode 3
So, I'm only going to talk about this for a bit. We still don't know who this kid is. What he looks like, his hobbies, personality traits. Is he funny? Smart? Charismatic? Charitable? I couldn't tell you.
Episode 15
Again I'm not going to go into too much detail here. I skipped most of the story to get to this episode, so I can't really speak on that. But it seems like, for the most part, the issues I've had so far, still linger. Passive voice, uninteresting or no descriptions, narrow diction and repetitive syntax, too much and confusing exposition.
Overall, I think you need to work on your syntax and your diction. Vary your sentences and structure your formatting to depth to the literature. Crack open a thesaurus when you edit. I personally have thesaurus.com listed as a bookmark in chrome. And try not to write in passive voice. Remove filler words like "had", "did", and "began" where you can so that the literature flows better.
Write descriptions! Of locations, of characters, of emotions and movement. And when you do write them make them more interesting! Use figures of speech: simile, metaphor, personification, hyperbole, etc. to vary descriptions and make them more or less important, depending on detail.
Show vs Tell. You need to find a balance in telling something to your reader vs showing. A good rule of thumb for me is if an exposition scene is going on for too long, I like to break it up with narrative, whether that be another character interrupting or a flashback. And if I am expositing, I try to make thing more interesting through character emotion.
Your characterization for Chaus in the first few episodes is lacking. We don't know what kind of person this kid is, other than he's quick to jump off the grieving train and quick to jump on the revenge train, which is strange for a child unless he has a personality disorder. But don't quote me on that.
Lastly, at least a little bit, it feels like you're using writing a fantasy novel as an excuse to show off the mechanics of your magic system. It's fine if you want to do that, but it needs to be more interesting if people are going to care.
That's all I have! Sorry if it came off a bit harsh, my intention isn't to hurt your feelings but to get you thinking like a storyteller. I do think this story could be interesting, it' just need work. Good luck to you and your story!