Draining weapons put a great strain on the plasma reactor of the Titan that fires them. Before attacking with a Draining weapon, the Titan’s reactor must be pushed. A unit that does not have a plasma reactor cannot use a Draining weapon. Some weapons have (Draining) after another trait - this means that they do not have the trait by default, but if they push the plasma reactor before attacking with the weapon, it gains that trait for the duration of the attack.
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