[Rhote]

Each suit can be pierced up to 4 times, when you pierce you go to the weapon NPC, introduce the suit, the moonstone and the gpro, if it suceeds it will get one pierce. If you have, let's say, 3 pierces in your suit, you can add to that suit up to 3 cards, these cards are any kind of card that has +% on it. Sucess rate is always 100% when adding a card to a suit. Now let's imagine you want to add attack to your suit, since it has 3 slots, it will be (0/3), now let's add a Thunder Card, it will now be (1/3) and will add +4% attack, now just repeat and so on.

Having a suit with (2/3) means the suit has 3 slots, 2 of which are filled and 1 slot is free to add whichever card you wish.