Class & Power System (Applies to Skills, Beasts, Summons, Power Structures):
1. Common
2. Uncommon
3. Rare
4. Unique
5. Legendary
6. Mythical (God-tier only; can only be reached via special conditions or floor progression)
7. Omni (Irregulars only — cannot be evolved into, must be born/fated with it)
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Class Evolution Milestones:
Floor 20: Common → Uncommon
Floor 30: Uncommon → Rare
Floor 40: Rare → Unique
Floor 50: Unique → Legendary
Floor 70: Legendary → Mythical
> Omni classes bypass this entirely; they're innate and extremely rare.
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Earth's Ranking System (Based on Floors Cleared):
F-Rank: Died before reaching Floor 10
E-Rank: Floors 10–19
D-Rank: Floors 20–29
C-Rank: Floors 30–39
B-Rank: Floors 40–49
A-Rank: Floors 50–69
S-Rank: Floors 70–99
Irregulars: Climbers with Omni classes or otherworldly traits, not ranked by floor count alone.
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Notes:
This system applies to all entities: SeTa, other Climbers, beast summons like Zuvanox and Zuriel, skill affinities, and class growth.
Earth's power structure now respects the Tower system completely, making returnees or messages from inside the Tower cause waves on Earth.
Irregulars are mysterious and feared — governments and corporations track their movements obsessively.