Enhancement

Enhancing costs gold and the higher the level a card is the more it will cost to enhance the card. After selecting enhance choose the card you wish to enhance. Select other card(s) - up to 10 to merge with the selected card that you wish to enhance to increase its level and therefore its attributes. The card(s) that you selected will then disappear and the attributes of the enhanced card will improve. Your leader card will not be displayed in the Merge card list. Once you max your card(s) level out by enhancing it you then must use evolution reagents to Evolve your card where it will return to level 1 with better attributes then its previous level 1 then enhance again.

Cards normally used as enhancing cards include.
Honey Fairy - 1,000 card experience

Akashic Fairy - 3,000 card experience

Normal and Normal + Cards.