NOVEL NEXT Chapter : [0.3]: Power level (not exact but just to give you an idea)
The power level is classified as follows:
[1]: Apocalypse Beasts (Trihexa), Great Red, and Ophis.
[2]: Principal Gods (like Shiva, Indra, etc.), Heavenly Dragons (Ddraig and Albion), and Super Devils (Sirzechs and Ajuka).
[3]: Satans (like Serafall), Archangels (like Michael), Gods (like Loki), Dragon Kings (like Fafnir), Evil Dragons (like Apophis), Daiyoukai (like Yasaka), and people with a Level 10 Falna.
[4]: Ultimate Class and people with a Level 9 Falna.
[5]: High Ultimate Class and people with a Level 7-8 Falna.
[6]: High Class and people with a Level 5-6 Falna.
[7]: Mid Class and people with a Level 3-4 Falna.
[8]: Low Class and people with a Level 1-2 Falna.
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A/N:
The general power level follows this scheme, although, of course, there are exceptions: some individuals can defeat opponents stronger than themselves.
A good example is Cao Cao, who, with the [True Longinus], becomes the natural enemy of demons.
I mention this to give you a clearer idea of the power level classification.
By the way, Aiden normally belongs to Class [2], but if he invests all his potential and uses the [Demon Kings], he wouldn't lose against someone from Class [1], although he wouldn't achieve victory either (for now).