These XP cards just like you gain other cards: by Lost Ark Gold performing various tasks within the game. They also have a rarity system with the most rare cards giving more XP (up at 9000).

Card Books

Start your Card Catalogue screen and click the "Book" tab. There, you'll find all of the different cards in the game grouped in different books.

Card Books are sort of an improved version which is an evolved version of the Card Set. Instead of granting power bonuses only when they are equipped (like the Card Sets) They offer smaller, but more durable bonus points that are passive and do not require to carry anything.

Since they are collectibles an entire Card Book is in essence a collection hunt. There are only 27 Card Sets that are available, but 173 Card Books!

Best Card Sets in Lost Ark

All of the 27 decks in Lost Ark provide very useful bonuses and stats. They're wonderful in their individual ways, but some of these Sets are superior to buy Lost Ark Gold the others.