How does the Nightbane -10 penalty apply to an exile's roll for attacks and reactions?

Question

Accepted Answer

The -10 applies to the final roll: roll the d20, add modifiers including the attribute bonus, then subtract 10, so the adjusted total decides a miss. Celerity on FOE-201 applies only on exile turns, and the special reaction triggers when an exile is attacked, which happens on foe turns.

Arydia: The Paths We Dare Tread

How does the Nightbane -10 penalty apply to an exile's roll for attacks and reactions?