Evolve your cards to higher tiers by combining two identical cards. The product will be a card that is of a better tier and stats. Make sure you max out the two cards you are leveling up to gain the maximum benefit. The new card will have its strongest ratings, and you will be able to level it up even further. Only improve cards that will be in use for awhile, such as those of the best rarity. In order to keep the Fellowship bonuses active, upgrade all your Fellowship cards to at least level 5 for the boosts.