In general, Augments are persistent ability cards that go in your active area when played. They will give you (not your summons) some persistent bonus (the part with the darker background) to all of your melee attacks once in your active area, and then will also allow you to immediately perform a one-time attack, which benefits from the augment just activated. The Augment part of an augment card is an ability and can be skipped so you can play the card for its other abilities and leave a currently active Augment in play.