1 - 2 - Anything below human level.
3 - 20 - Average Human to Peak Human(physically).
21 - 500 - Low-Class Devils and Baby Familiars.
501 - 5,000 - Mid-Class Devils, Full-Grown Average Familiars and Low-Class Dragons.
5,001 - 25,000 - High Class Devils, High-Class Dragons and Minor Gods.
25,001 - 300,000 - Ultimate Class Devils, Small Faction Leaders and Average Gods.
300,100 - 1,500,000 - Dragon Kings, Devil Kings, Seraphs and Longuinus Wielders at their average prime.
1,500,100 - 15,000,000 - Chief Gods and Evil Dragons.
15,000,100 - 100,000,000 - Super Devils and the Two Heavenly Dragons.
100,000,100 - Omega - Primordial Deities.
Omega - Great Red, Ophis and Trihexa.
Omega+ - Anything above the previous characters stated.
I copy and pasted because I am lazy also if I read the LN or the Manga I'm gonna have my OC absolutely annihilate the Outer Gods but that's only if I read the LN or Manga