The XP cards are the cards which reflect which stories/experiences player was encountering in the game. The experience is not necessarily personal, it can be what player observed other creatures passing through as well. But every creature has its own XP cards, irrespective did they experience it or just observed.
XP cards are based on villages forming stories.
Every card reflects one specific experience. For example experience of
For different lightness level creatures the same experiences would have different meaning.
For example for a light creature making a friend is becoming one with the creature. But for a dark creature it would make no sense, they forget how to make friends and how it feels.
Or for dark creature asking other to do something would mean forcing it to do so. For light creature — just asking because they're friends and want to work together on a common project.