Details on both how Criticals are procced and are scored.

$$critchance = tech_e * \frac{3}{100000} + bondboard + \sum_{Skills}skill + \begin{cases} 0.15 & \text{if Tech is the highest stat} \\ 0 & \text{otherwise} \end{cases}$$

$bondboard$: The Critical Chance bonus from the Bond Board of the character

$skill$: The percentual effect of an active Critical Chance buff/debuff

The condition for the 15% bonus uses the card's defined stat distribution. Tech must be the single highest stat, if tied with another stat the bonus will not apply. The easiest way to check in game would be finding the raw stats of a card - before any skill tree spaces, bond board bonuses, accessories or passives. Whether a card receives this bonus or not is hardcoded in the game's database¹⁾, and will not change even if any step of the stat calculation would raise another stat enough to be higher than Tech.

To do: Is there a difference between Base Crit Chance and non-Base Crit Chance skills? Are all of them additive?

$$critmulti = 1.5 + \sum_{Skills}skill$$

$bondboard$: The Critical Power bonus from the Bond Board of the character

$skill$: The percentual effect of an active Critical Power buff/debuff

To do: Is there a difference between Base Crit Power and non-Base Crit Power skills? Are all of them additive?

To do: Is the Bond Board bonus multiplicative or additive?

(Editor's note: at least this is easier to test than pseudorandom crit chances woo)