Evolution is a feature unique to Nightbanes. You do all evolutions in the Evolutions Tab, in the Shop.
Evolution[ | ]
Evolution allows you to fusion several cards into more powerful cards, that combine their strengths and abilities.
Levelling[ | ]
Some Cards can be leveled to increase their Rage and Health, reduce the size of their Bloodlust counter, gain new or improve existing abilities or combinations of these. Leveling a card will cost one lower level card, and an amount of Bloodpearls.