May contain some spoilers
Ranks(ascending order):
Kappa(Κ)
Iota(Ι)
Theta(Θ)
Zeta(Ζ)
Eta(Η)
Epsilon(Ε)
Delta(Δ)
Gamma(Γ)
Beta(Β)
Alpha(Α)
Note: This rank doesn't really determine the strength level of Sentries. It increases according to the Sentry's achievements.
Although only stronger people could achieve higher ranks.
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Abyssal's ranking(ascending order):
Lesser abyssals
Higher abyssals
Greater abyssals
Peak abyssal's
Note: Who knows, this might not be the end
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Threat levels: The level of threat which an abyssal poses.
Lesser abyssals— 1.0
Higher abyssals—2.0
Greater abyssals— 3.0
Peak abyssals— 4.0
Abyssals with abilities have a 0.5 added to their threat levels. For example a higher abyssal with an ability would be 2.5 instead of 2.0
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The top 200 ranking is the ranking of the 200 most powerful Sentries.
The talent ranking is the ranking of the most talented Sentries (Those able to grow stronger within a short period of time).
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Terms explanation
A-genes: The abyssal's Gene contained in aberrants(Those who possess enhanced superhuman traits or abilities)
A-scale: The amount of A-genes present in an aberrant. (1.0—5.0).
Scale raising: The increase of an aberrant's A-scale, intentionally or unintentionally. (Can increase power, but has negative effects)
Cell burning: This happens when an aberrants overuse their abilities, hereby affecting their human cells. (Negative effect).
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Glossary would be updated as the book goes on.