It’s more of a title for the future, he has yet to unlock all of his potential especially in the terms of his “irregular side”. Probably in the near future, you would be able to see the “immortality” you’re expecting to see.
The problem I have is that it's shittily scaled. It's all over the place with the people being strong or not.
The more I read, the more confusing the power system gets. At first, nobody knows how to use Aether. MC can't use Aether either. But what powers such strengths as his Healing ability? At first I thought it was Aether, but then the mother's family says that they had "Healers" in their family, so it wasn't actually something people didn't know about at all, but rather well known within an entire family, which happened to be influential until a few decades ago. MC mentions how he must have used Healing unconsciously before in a later chapter, and his mother also must have used it to keep herself alive, so it had nothing to do with the "Aether Hole", especially since "Irregulars" seemed to be people who simply awakened special classes. But that doesn't seem to be the case either, so I'm taking it that it's simply skills, and since that, as well, is something people just "forgot" about (I'm taking it that more things have been hidden in history than the Dragon-bearer covenant of their ancestor), people wouldn't understand and just call them irregulars.
But again, what powers these abilities, especially within a person like the MC, who has a physical impairment, making him unable to save, convert, and overall utilize Mana at all, when Aether isn't the answer either?
And my main complaint is that the system uses the mechanic of leveling abilities up and even adjusting them, but they still went and called these things by outrageous names right off the bat. "Immortality" is one thing, but why also shit like "Infinite Stamina", if the stamina is not, in fact, infinite at all? Why not "abundant stamina" or some random, catchy name that vaguely refers to what it means, since we immediately get the explanation either way?
Again, outside of slightly shitty pacing and a very flat set of characters, I actually like this story. But the power scaling just isn't there.
I mean, come on. First, we know there are four siblings, but we barely hear anything about anyone, outside of way-too-short blurb texts. Until now, we still don't know what dirty deeds Abel has even done to be referred to as the slaughterer knight, because that sounds quite extreme. So when his second sister showed up, we knew nothing about her, but the story still tried to immediately hype her up.
Only to progress into the tournament at the end, showing us that, without Aura involved, she had to earnestly put in her strength to fight Felix. But Felix fought and seemingly easy lost to Liam. Yet Liam lost to Reina. I get that MC didn't lose to his sister, so Reina being weaker than him doesn't mean that much, because it checks out. But in all honesty, that would just mean that Liam would do a lot better than Felix and Reina would do even better than that, leaving Zeke at the top, since he's a huge leap stronger than any of them. So why did it take him this much effort to beat his sister, even with Aura involved? His base should be a lot better, and it was ages ago that he said he was already knocking on the Wall to Obsidian. Even if he stagnated since then and didn't progress an inch, it would still mean that he should not be that much worse in fighting with his base this strong and his proficiency with Aura (even if he hides some of it, so people don't realize he's beyond an Azure knight by now). While yes, he won, the author still needed to show how great the sister is, so that's the result.
But that just means the scales are all over the place.
The thing is: I don't dislike this at all. At the same time, this shit is all over the place.
First, he's "immortal". What does immortal even mean, when the system needs to shut his consciousness down in order to keep him safe? Duke just showed him that he's not immortal by a long shot.
Okay, so we took away from the OP unbeatable attribute - but it's still stupid, because it's called "immortal" and shit like "infinite stamina". It ain't infinite, if it ain't infinite, author.
But even so, though he seemed to have been strong in his last life and whined about having to do a course, because it took him two years to master in his last life, eventhough it sounds as if he has barely any fighting style that you could call a fighting style during the brawl with Duke Draker (if you just pretend to be a genius, which isn't far off from what he's doing anyway, you can get out naturally by pretending to finish the course by perfecting it, no? And if you can't, because you can't actually use this swordsmenship, why not actually attend and learn some?). That's an immense let-down, because it feels less of an overpowered guy due to his hardships and training, but more of a mediocre fighter with no real swordsmenship to speak of, who only survived due to something he was born with.
Well, but he did lean Aether, which is great, right? Uh, no, not really. Because we go on to learn that Aura is a lot greater than Aether, which also means he HAS to use the Sun Sword in order to counter real Aura. But I really hate things like this, because it means he's simply overgeared.
Yes, someone without Aether couldn't use the sword, so that's great and all, but someone with innate Aura can use Aura with any weapon, while he's royally fucked if he ever loses his fancy gadget sword.
WHY didn't they give him the chance, with the system or the dragon heart - or really, at any point in the story - to develop Mana. In that case, he'd still have to show that he trained tirelessly, but his body was simply unable to give him access to Aura. All he needs is the possibility in his body and he can show what he can do. That would have been much more satisfiying and a better solution than getting a stupid gadget to make up for not being able to actually face any other knight, because Aether can't properly go against it.
I don't know. Sure, I will keep reading, but that shit is disappointing.