Fall Defence

Fall Defence is a gem effect in Xenoblade Chronicles. It reduces the amount of damage taken from falling from too high. However, it only works against falls that are already survivable; it does not change lethal falls to non-lethal falls.

Overview
Fall Defence is very situational. It only truly has use if the player expects to be falling a long way and immediately landing in a crowd of enemies without avenue to rest first. Still, being able to recover to full health faster will speed up vertical exploration.

Since fall damage is based on percentage of max HP, putting Fall Defence on a tank will reduce the raw amount of HP lost in case of fighting being expected. Conversely, AI party members cannot drop below 1 HP unless a battle is in progress, so reserving them for the player-controlled member is better for when enemies are not a factor.