The Author Avatar concept
The Author Avatar is pretty much self-insertion. Many authors write themselves or an idealized version of themselves into a story because they'd like to be a superhero themselves. It's pretty much what Matrix did. Everyguy loser-type dude suddenly becomes the Chosen One.
Magically it means part of the original author soul is "stretched" so it can connect with two physical bodies. It's technically still one soul as the two parts are connected via the silvercord, but the connection isn't that strong. Maybe you can compare it to the umbilical cord between mother and child, only in this case since we're talking about souls, at least part of the author's memory is also transferred to the author avatar.
Escapist Fantasy
The story undergoes a pretty hard shift of tone in my opinion, which is connected to the different Ages. It's also a bit "meta", "a story about a story" as in the first part in the Golden Age is similar to the power fantasies that make up many first stories and early fanfiction authors come up with, including self-insertions and a simple story about good (Sera) and evil (Karive), but over time it gets more sophisticated and the author avatar gets a unique personality, just like authors when they get better can write more and more freely and at some point don't have to rely on something like self-insertion at all.
Dreams becoming Reality
It's actually pretty much the basis of the existence of worlds if you think about it. I think I didn't write you about the structure inbetween the different worlds yet. I'll compare it to our solar system because there are some parallels:
First of all, imagine a dark empty space. In this story, we call in the void. We know from our universe that it looks empty, but according to calculations there must be a lot of "dark matter" and "dark energy", we just can't sense it with our technology. Imagine this resource being what makes up the "void" in the story. It somehow exists, but we can't confirm its existence with our own senses. That's why we feel it's emptiness or void.
In this void, we got the different worlds like planets. Like in a solar system, they're centered around a single entity. In the story, it is "the heart of magic", the "Mavorcé", something that is believed to be in the middle of the Known Space (the umbrella term for the void and everything in it - like Universe in our world is the umbrella term for planets, stars, the space in between etc). The Mavorcé can actually be compared to a Black Hole in that it drains magical energy, but also ejects it via "jets". This way it creates a magical flow that goes through all the worlds. The closer a world is to the Mavorcé, the more magic it'll get, like planets close to our sun are very hot, more distant worlds get only very little or no magic, just like distant planets in our solar system are very cold. A world without much magic would thus be very distanced from the Mavorcé. Fiction that builds outside the canon of a world doesn't become a completely new world, but mostly a mirror that reflects most parts of the base world and only adds a few own things, like a moon surrounding their planet.
Back to "Dream and Reality"; like I told you, fantasy is capable of creating new worlds that are as much reality as you see your own world. There are many layers of fantasy however, from quick ideas you forget in five minutes to elaborate and complex worlds with its own rules and characters that are so complex you could imagine they could exist as real people.
Even if you just have a quick thought, the void will create it or attempt to create it. The effect isn't instant, so maybe you'll forget an idea and the void won't even have fully created it before the creation process is stopped. If you create something that instable, the magical flow in the void will simply rip it apart. Dreams for example only last a small time in the void before they're forgotten/ripped apart by the current. I'll tell you more about this when we get to Karive.
Kharseth
...is the boy I was talking the whole time about, but he is also not. Oh so mysterious. It's simple actually.
The boy I'm referring to at the very beginning is just an author avatar remotely connected to the soul of Arkenighte (the original soul of the body). That's not a new person that could earn a new name. However, over time, not only does the author avatar part of the soul begin to differ greatly from who he was at the beginning of his journey, by fusing with Arkenighte's soul he also mixes his memories and abilities with that of a different person. As you may know from sex education, mixing two existing things to one new thing is commonly seen as the creation of something unique and new. In this case, think of it as not genetic material mixing, but souls, which sounds pretty abstract, but I'm trying to explain it more in detail in the story. Can't stuff everything into the ""summary"".
With the outbreak of the demon, the souls within the body also undergo a rapid development and finally fuse together to one single new soul that makes up a new, unique mind and a unique character that may have aspects from his two original souls, but now with the mix and his own experiences in this world makes up a new character. Thus, after the battle when he is accepted into the ranks of Silvernight and the Traumkrieger, he makes up a new name (this is offered to everyone who enters the Silvernight as they're now beginning a new life in a completely new world and should be given the opportunity to start from zero in every regard) and that's Kharseth and also the point of time when the author finally calls him by his own name.
To summarize:
- Author Avatar + Arkenighte = Kharseth
- Arkenighte is the drow who originally inhabited the body
- the Author Avatar is the "new soul" that takes control of the body for most of the time
- the two souls slowly fuse together to a single one, but since they're still separated, both souls still have a mind of their own. There's only little exchange of information.
- the Author Avatar calls himself "Marik Bentusi" as he thinks he now has the chance to lead a completely new life
- After the two souls fuse completely together and after the Author Avatar has had enough experiences to make up a new personality, the author accepts them as a new unique person with the name Kharseth
Lilly (or Lilliath in the full name nobody calls her with) is a character introduced a bit later in the story. The Silvernight is clever and eventually finds out that Kharseth is under the control of the author, enabling the author to write from his perspective. They cut this connection (the silver cord) completely off and do a check with all the other characters in the Silvernight Kharseth had contact with, including Talitha. Thus it is now impossible for the author to control their actions and make them run through a script he writes. They're "safe" in the Silvernight. Not even Karive can touch them anymore, so they're told. And really, the daily nightmares he sends them stop.
Now shit goes meta as the author has the task to get back into the Silvernight somehow.
The only person left that the author can control or influence is Karive. It is never explicitly stated, but in order to bring a person under the control of the avatar, they have to had some interaction with another character the author can control, like a disease that's spreading. That's also why he used Cartz in order to get into Apotropé and write from Talitha's perspective.
It's enough for Karive to send Lilly a nightmare in order to "infect" her and make her the third protagonist (Kharseth and Talitha being #1 and #2). Lilly is a slave of a drow clan who was sold at a very young age, she can barely remember her family. Waking up due to the nightmare is actually lucky for her as this way she grasps an opportunity to escape. I haven't written these parts yet, so there's only ideas roaming around. She makes a narrow escape, but living underground for her whole life she eventually is overwhelmed by the morning sun. The drow warriors that go after her however are explicitly trained to resist the sunlight and can thus hunt her down "normally". Due to "luck" however - don't think Karive is innocent - Kharseth and Talitha find her while on the way to a quick mission.
Just as planned. *trollface*
If you think it's all fitting a bit too well together, here's a bit of reason why:
Lilly is Arkenighte's twin sister. Her existence was quickly cleared from the records however when the family found out she's a very strong Anarcane. Arcanes are about treated as well as Jews in the early days of Hitler, they're not (all) killed, but they're definitely at the very bottom of society. Her luck however. When the Traumkrieger destroyed the whole clan associated with Arkenighte so the illegally imported technology would be destroyed along with everyone that knows how to use it, they didn't find her in the records and thus she was able to survive. She's not the sole survivor, but one of few.
Thus she's living in the same world as Apotropé is located it, the one with the Army of Nightmares, etc, so it was easy to find a reason why Kharseth and Talitha would be around. I imagine Kharseth wanted to go down to the laboratories again where Arkenighte once restored parts of his body. I'll find a reason.
Lilly is exactly as old as Arkenighte, but her body looks much younger than his, which is due to slave keepers controlling their slaves so they couldn't outgrow them in any aspects. Luckily her master isn't a woman (and not a rapist either) so she wouldn't have been able to keep her pretty face either. Her master isn't half bad by comparison, which is however mainly due to him being more interested in fighting than women and the two spent a lot of time together. Lilly was sold as a slave early on and since her future master's parents wanted their son to be able to direct salves very early on, they got him a slave when he was still very young, too. It's like European parents these days wanting their children to learn English as soon as possible because they'll need it later on.
So yeah, he isn't exactly so nice that Lilly wants to stay a slave for her whole life, but he isn't a complete asshole to her either.
Traumkrieger
Traumkrieger as they're seen now are a group of people with a certain set of abilities that make sure stories play out the way they're intended to. Authors - and by authors I really mean anyone who thinks up a story or character - are shaping worlds, but worlds are also shaping them back in the same way. I haven't explained the connection in detail yet, so you'll just have to swallow that there's "a connection" between the author and his/her creation.
If however in this world for some reason there are for example 14 horse riders appearing instead of 13, the author's very idea will change and he or she will write about 14 instead of 13 horse riders. That's how both the author shapes the world and the world shapes the author. That's just one example. Traumkrieger are most commonly world travelers, so they feel they have to carry responsibility for breaking the isolation of worlds and unbalancing them. If you believe in chaos theory or the butterfly effect, even small actions can develop big effects over time. That's how many worlds get fucked up over time and as people just keep joining Silvernight, the problems don't get less.
However, the Traumkrieger have also developed technology in order to monitor chaotic differences that "weren't supposed to happen". After all they can gather scientists from the most advanced worlds that exist. Sometimes entire worlds are about to collapse and the entire population is about to be torn apart by the magic current in the void and so the Traumkrieger come in and pick up whatever looks like an interesting addition to them. Technology, memory, people, whatever helps the Silvernight.
Traumkrieger are also able to identify people with Traumkrieger abilities fairly quickly... if you didn't jam their system, Karive. It doesn't always work so early you can see a small child is a Traumkrieger, but they're getting there.
Now, the special abilities of Traumkrieger that make up the very definition if you're one of them or not. You're born with it, but they have yet to find the sample of a still unborn Traumkrieger in development that could show them exactly why they have these abilities.
There are three abilities that divide the Traumkrieger into three types. Type 1, warping space, Type 2, warping time, Type 3, warping "information". The division alone is a big "fuck you" to nature as we all know since Einstein that you can't separate space and time when we have spacetime. [http://en.wikipedia.org/wiki/Spacetime]
Traumkrieger are breaking the very rules of logic and nature. Really. To simplify, if you have a chess piece on A1 and put it forward by one chess field, it should end up on A2, correct?
With the Traumkrieger ability of manipulating space, you can just change the very logic and make the chess piece appear on E5 or something. It's a bit like in game menus where you move the selection of options with the arrow keys and you use the "down" key at the bottom of the list of options and suddenly you're selecting the very top entry of the menu. Only with this ability you dictate from where and to where you jump. You make the rules.
Time manipulation of course makes you fuck with the flow of time like you've seen in many times before in fiction. Of course this again fucks with logic and Einstein as time is linear and you can't go back in time. Once again, Traumkrieger abilities fuck that up.
Manipulating "information", Type 3, is the rarest type discovered and thus not much is known about it. It is believed however that it can change for example that gold's "color information" suddenly become green without manipulating anything else. It's also very easy to manipulate memory with that even tho you don't know anything about chemistry, biology or electrons.
Maybe now you know why the Traumkrieger try to gather other people with these abilities no matter the cost. It's too risky to let people with such abilities simply experiment or do what they want. Since Type 1, space manipulation, is the most common ability, and Type 3 is the most rare ability, there isn't much progress in research in this regard, either. Type 2... well...
Like I said, most of the Traumkrieger are Type 1 and manipulate space. Type 3 looks like it's something interesting, but nothing that could (yet) lead to FUBAR everything. Type 2 however... time travel can be very, very dangerous. Travel back in time and kill your parents? Normally just a hypothetical mind game as you can't ever travel back in time, logic forbid. Type 2 Traumkriegers however can and the council consisting mostly of Type 1 grows to fear their abilities. At some point in time, the debate between them and Type 2s concerning the issue grows more and more heated until the Type 1 Traumkrieger decide to annihilate all the Type 2 Traumkrieger and proceed to doing so with any confirmed Type 2s they'll encounter in the future. Of course Type 2s are only as capable of fucking up everything as Type 1s, only if they really try, but Type 1s weren't able to understand them or their abilities and they were in the majority, so... yeah, it's sorta tragic.