I have got the Utility Belt (+25 deftness), the Honour Among Thieves (+3 defense), and the Medal of Freedom (+100 Deftness). Which of these accessories would help my thief's Half Inch be most successful?
Here's what I found:
Because it doubles the steal chance, Honour Among Thieves increases Half Inch's success the most.
The percentage of success for Half Inch is:
Where deftness is the character's deftness, and dropRate is the dropRate of monster's item.
For a character with 0 deftness, Medal of Freedom results in a success rate of 2.21 * dropRate. For the same character, Honour Among Thieves results in a success rate of 3.57 * dropRate.
Additionally: The percentage of success for the Thief's Theory scroll is
The Medal of Freedom. The highest increase of deftness will lead to the better chances of Half Inch being successful.