Calculate the exact number of skill books needed for your upgrades
| Level | Books Required |
|---|---|
| Level 1 | 0 books |
| Level 2 | 100 books |
| Level 3 | 300 books |
| Level 4 | 700 books |
| Level 5 | 1300 books |
| Level 6 | 2100 books |
| Level 7 | 3200 books |
| Level 8 | 4600 books |
| Level 9 | 6300 books |
| Level 10 | 8300 books |
| Level 11 | 10500 books |
| Level 12 | 13200 books |
| Level 13 | 16400 books |
| Level 14 | 20300 books |
| Level 15 | 25000 books |