In this world skills are classified into following ranks from low to high based on their capabilities:
1. Common Rank
2. Uncommon Rank
3. Unique Rank
4. Rare Rank
5. Epic Rank
6. Legend Rank
7. Myth Rank
8. Transcendent Rank
9. Divine Rank
10. Origin Rank
11. Concept Rank
These ranks will also have + or - added before them depending on whether they are stronger or weaker than their supposed rank but is too weak to be ranked in the higher rank or too strong to be ranked in the lower rank.