Physical Def Down

Physical Defence Down (or Phys Def Down) is a debuff in Xenoblade Chronicles. It increases the amount of physical damage taken by the victim by a percentage.

The math of the debuff differs depending on whether it is applied to a party member or an enemy. For an example where the debuff's percentage is 25%:
 * On a party member with 200 physical defence, the value will be multiplied to equal 150.
 * On an enemy with 30% physical defence, the value will be subtracted to equal -5%.