The power system of this world follows a simple progression, it isn't anything new.
Minor realms
1. Initial (0-20%)
2. Early (20-40%)
3. Mid (40-60%)
4. Late (60-80%)
5. Peak (80-99%)
6. Half-step (99.n)
Major Realms
SPOILERS AHEAD!!!
Warning!: This scaling is flawed, in some instances it might not correspond to the novel at all, but this is the general progression of the characters. I decided to add my scaling in the end so I might get you fired up for what is coming.
Novice[1]
Intermediate [2]
Advanced[3]
Expert[4]
Master[5]
Grandmaster[6]
Saint[7]
Paragon[8]
Demi-God[9]
Beastkin
Dormant-rank beast[10]
Awakened-rank beast[11]
Junior-rank beast[12]
Elder-rank beast[13]
Terror-rank beast[14]
Colossus-rank beast[15]
Beast Lord[16]
Beast king[17]
Beast Emperor[18]
[1] Attack potency: 9-B (wall)
Speed: Peak Human-(mid)Superhuman 10.03-20.05 m/s
Lifespan: no changes
[2] Attack potency: 9-A (Small Building)
Speed: (high)Superhuman-low Subsonic 20-50 m/s
Lifespan≈100
[3] Attack potency: High 8-C (Large Building)
Speed: Subsonic 50-171.5 m/s
Lifespan≈130
[4] Attack potency: 8-B/8-A (City Block-Multi-City Block)
Speed: Subsonic+/Transonic 171.5 - 377.3 m/s
Lifespan≈250
[5] Attack potency: Low 7-C/High 7-C (Small Town-Large Town)
Speed: Supersonic/Supersonic+ 377.3 - 1715 m/s
Lifespan≈500
[6] Attack potency: Low 7-B/High 7-A (Small City-Large Mountain)
Speed: Hypersonic/High Hypersonic 1715 - 17150 m/s
Lifespan≈800
[7] Attack potency: 6-C/6-B (Island-Country)
Speed: High Hypersonic+ 17150 - 86000 m/s
Lifespan≈1600
[8] Attack potency: High 6-B/5-C (Large Country-Moon)
Speed: High Hypersonic+/Massively Hypersonic+ 86000 - 500000 m/s
Lifespan≈3400
[9] Attack potency: Low 5-B/5-A (Small Planet-Large Planet)
Speed: Massively Hypersonic+/Sub-Relativistic 500000 - 3997925
Lifespan≈15000(?)
[10] Attack potency: 9-B (wall)
Speed: Peak Human-(mid)Superhuman 10.03-20.05 m/s
Lifespan: 150
[11] Attack potency: 9-A (Small Building)
Speed: (high)Superhuman-low Subsonic 20-50 m/s
Lifespan≈300
[12] Attack potency: High 8-C (Large Building)
Speed: Subsonic 50-171.5 m/s
Lifespan≈500
[13] Attack potency: 8-B/8-A (City Block-Multi-City Block)
Speed: Subsonic+/Transonic 171.5 - 377.3 m/s
Lifespan≈900
[14] Attack potency: Low 7-C/High 7-C (Small Town-Large Town)
Speed: Supersonic/Supersonic+ 377.3 - 1715 m/s
Lifespan≈1500
[15] Attack potency: Low 7-B/High 7-A (Small City-Large Mountain)
Speed: Hypersonic/High Hypersonic 1715 - 17150 m/s
Lifespan≈3000
[16] Attack potency: 6-C/6-B (Island-Country)
Speed: High Hypersonic+ 17150 - 86000 m/s
Lifespan≈7000
[17] Attack potency: High 6-B/5-C (Large Country-Moon)
Speed: High Hypersonic+/Massively Hypersonic+ 86000 - 500000 m/s
Lifespan≈20 000
[18] Attack potency: Low 5-B/5-A (Small Planet-Large Planet)
Speed: Massively Hypersonic+/Sub-Relativistic 500000 - 3997925
Lifespan≈50 000(?)