Fatal Damage is a mechanic used in the Yggdra Union series. This occurs when a card skill is used on an opponent that is weak to its elemental alignment; Revolution is a special exception, as its purpose is to grant the user a come-from-behind victory. Using such a skill ignores GEN/TEC difference. When Fatal Damage occurs, all of the enemy's soldiers will be knocked out immediately, reducing the HP of the leader; Fatal Damage practically ensures that the enemy will lose unless other factors come into play.

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