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Class - The category of the power level hierarchy be like:
Low class, Middle/Mid class, High class, Ultimate class, God class, Primordial/ Dragon God class.
Satan class, Cadre class, Seraph class, Super devil class, and Heavenly dragon class falls within God class as well.
Tiers - The level of power of something within that class like:
Low tier, Mid/Middle tier, High tier, Peak.
So this mostly comes out like "That Freed is the most powerful among those brute priests. I estimate him to be in the high tier of the high class level with the level of speed and strength he had shown or maybe possibly even higher."
You could still use the shortened version. I'm just making this clear for the future.
Of course, since this is a fanfic and I haven't watched or read DxD at all except reading fanfics, this is mostly just headcanon, wiki info, glazing, and agenda. So don't go bitching about, "Ackshually, this isn't in line with canon☝️🤓." *wipes snot from nose and adjusts glasses*
Just think of it as AU, since that's what a fanfic practically is.
Sirzechs is going to be the Gojo in this story somewhat so he is definitely gonna get glazed and upscaled for the sake of the plot.
Issei is going to be the Yuji of this fic, he doesn't compare to THE GOAT though. But I'm gonna make Issei go through a series of character development, romance, suffering builds character, power-ups, etc. and not exactly in that order throughout the story.
The main characters of this is definitely Mahito and Issei as they are the main rivals within the story. Just know that there will be moments where they are not the focus of certain plots.
Also, humans can see Mahito, cursed techniques, and allat. This is because of the way mana works in the world of DxD, letting them perceive the supernatural. That's why supernatural beings rely on barriers and mind fuckery to keep it a secret from the mundane. Atleast that's how shit works in my fic.
In this fic, I made it so that Issei's boost adds a 2x multiplier to his base power every time he boosts. So imagine he has 100 power level at base, with his first boost it becomes 200, them second boost it would become 400, at his 20th boost it becomes 4000, and so on and like high class level is like 30,000 just for example, this would make him not too op too fast and make him training actually mean something instead of just stupid boobs powerups. Doubling his power with each boost is too op and ridiculous, while also being harder to scale.
I'mma tweak how the magic/power systems works here too, since the canon is way too vague.
Also, most characters of DxD in this fic are somewhat different from their original, wether small or big.
Binding vows are a part of this verse in my fic. Well atleast those who can use ce hehehe.
I'll add more shit here to clarify if I need to. Also if you have further questions, then just ask here.