When an attacker makes an attack against a target, the attacker rolls their attack test as indicated by the weapon used or the ability employed.
If the target does not wish or cannot perform a dodge or a parry, the result of the attack test is then compared to their physical defense (Def PHY) for a physical attack at close or ranged distance, or to their magical defense (Def MAG) in the case of a magical attack.
If the result of the attack test is greater than or equal to their Def PHY or Def MAG depending on the context, then the attack succeeds, and the target suffers the damage indicated by the weapon or the ability.