Ailment Accuracy Mechanism
P5X contains various effects that have chance rates.
A representative example is Tomoko’s Skill 3 — at LV12, it has a base chance of 81.3% to inflict Sleep on the enemy.
However, even if you grant Tomoko more than +20% Ailment Accuracy through Revelation cards, enemies will not be inflicted with Sleep at 100% chance.
This happens because Ailment Accuracy is not calculated through simple addition. According to the developer’s response, the calculation formula is as follows:
Formula
ⓐ Base Chance × (1 + ⓑ Total Ailment Accuracy) ÷ (1 + ⓒ Enemy’s Ailment Resistance)ⓐ Base Chance
The base chancey is the chance written in the skill or effect description. For example, Narcissus’s “Vertigo” (paraphrase) skill has a base chance of 32.6% at LV6.
ⓑ Total Ailment Accuracy
Narcissus can gain up to 42.9% (24.9% + 18%) Ailment Accuracy through their innate passive.
Wonder separately can have a base 80% Ailment Accuracy. In this case, it would be 42.9% + 80% = 122.9% Ailment Accuracy.
In addition, you can increase Ailment Accuracy through various passives, weapons, and skill effects. This refers to the total sum of all such bonuses.
ⓒ Enemy’s Ailment Resistance
Each enemy has its own unique Ailment Resistance value.
Like the enemy DEF stat mentioned in the past damage formula, this value is not publicly displayed.
(Game company, please let us check detailed enemy stats in-game soon!)
Example Calculation
If we assume the enemy’s Ailment Resistance is 10%, Narcissus’s “Vertigo” skill in the above situation would have the following chance to inflict it:
- Vertigo Base Chance: 32.6%
- Narcissus talent + Wonder Ailment Accuracy: 122.9%
- Ailment Resistance: 10%
32.6% (1 + 122.9%) / (1 + 10%) = 32.6% 2.229 / 1.1 = 66.05%If we assume the enemy has no Ailment Resistance, to inflict Vertigo with 100% certainty:
100% / 32.6% - 1 = 206.7% Ailment Accuracy is required.
Reference: https://gall.dcinside.com/mgallery/board/view/?id=persona5phantomx&no=86272