Your exhilaration in combat revitalizes you when you down a foe. When your direct attack incapacitates an opponent (brings them to zero or lower hit points, or stuns, disintegrates, or knocks them out etc.), you get a free action to be taken immediately.
Any skill check for this action will be at a penalty equal to the number of times this ability has already been used during this campaign turn. (The first use is at no penalty, the second use is at a penalty of +1 to the skill check difficulty, if any, on the free action and so on.)
This ability can only be used a maximum of once per Phase.