From Rise: The Vieneo Province
Dexterity (Dex) measures hand-eye coordination, agility, reflexes, and balance.
You apply your character’s Dexterity modifier to:
Ranged attack rolls, including those for attacks made with bows, crossbows, throwing axes, and other ranged weapons. Armor Class (AC), provided that the character can react to the attack. Reflex saving throws, for avoiding fireballs and other attacks that you can escape by moving quickly. Balance, Escape Artist, Hide, Move Silently, Open Lock, Ride, Sleight of Hand, Tumble, and Use Rope checks. These are the skills that have Dexterity as their key ability.