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Wizard's Hat

Wizard's Hat

Legendary
Expand magical knowlegde. +10 max levels for all tomes. Gives one less max level per stack, for a minimum of 2 at 9 stacks
Scaling Type:
Decreasing linear scaling (diminishing returns) per additional copy, with a minimum of +2 max tome levels per copy (from 9+ stacks)

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).

How it Stacks

Let $n$ be the number of Wizard's Hats.
 

Max tome levels gained per hat (diminishing)

The amount added by the $k$-th hat is:
 
 
$$\Delta(k)=\max(2,\ 11-k)$$
 
 
So the first few hats give:
 
- 1st hat: +10
- 2nd hat: +9
- 3rd hat: +8
- 4th hat: +7
- 5th hat: +6
- 6th hat: +5
- 7th hat: +4
- 8th hat: +3
- 9th hat: +2
- 10th+ hat: +2 each