Evasion is a trait of most flying units in XCOM: Enemy Unknown.

Enemies targeting this unit when it is airborne suffer a -20 Aim penalty.

– In-Game Description, XCOM: Enemy Unknown


This trait is confers a de facto +20 Defense bonus to flying units while they are airborne, including Cyberdiscs, Drones, Floaters, Heavy Floaters, and XCOM soldiers wearing Archangel Armor. Also granted to Seekers in XCOM: Enemy Within.


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