Reinforcement cards +_ are cards that can boost one side of the encounter. They can be played after encounter cards are revealed in the Reveal phase, by either main player or by any ally, to increase either side's total (the player's side or the opponent's side) by the value of the reinforcement, and are discarded after use. Reinforcements in the cosmic deck have values from +2 to +5 (or up to +8 if playing with the large group cards from Cosmic Alliance); those in the reward deck can go up to +6 (or even +9 in the Cosmic Odyssey ultra reward deck).
According to FFG's 2018 FAQ, reinforcements may not be played on N s. Doing so would have no effect anyway.
 Cards
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