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, commonly known as Crit Profile or Critical Sense, uses the card's defined stat distribution. Technique must be the single highest stat, if tied with another stat the bonus will not apply. The easiest way to check in game is checking the nodes in the card's training tree - if the increase per node is bigger for Technique nodes than for the other two stat nodes, the card has crit profile. 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?

$$critmulti = (1.5 + bondboard + \sum_{Skills}skill) \cdot accs$$

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

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

$accs$: Sum of Base Critical Power Accessory effects (Hairpins and Bangles). See Accessories for Skill Effect calculation

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)