The diamond shaped symbols at the bottom right of every Character card is its Lore Value, which is the amount of lore you gain when the character quests. A player can choose to quest with a character by exerting it. Currently, the lowest amount of Lore Value on a character card is 0. Conversely, the highest amount of Lore Value on a character card is 5.
On Location cards, the Lore Value is printed in the top right when looking at it vertically. When in play the Location generates Lore regardless of if there is a Character on it or not. Currently, the lowest amount of Lore Value on a location card is 0. Conversely, the highest amount of Lore Value on a location card is 2.