Detailed Explanation
Wizard's Hat increases the maximum level cap for all tomes.
No hidden mechanics:
- The 1st Wizard's Hat gives +10 max tome levels.
- Each additional hat gives 1 less max tome level than the previous hat.
- This falloff continues until a minimum of +2 max tome levels per hat (reached at 9 stacks and beyond).
So it’s a "diminishing returns" max-level increase that only affects tomes (not weapons).