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Bloodthirst
Heal on each kill. Official Wildshift wiki.
Bloodthirst is a defense level-up card.
Official description: Heal on each kill Further picks: Heal more on each kill.
Each level-up offers 3 cards from one category (offense, defense, or utility), never mixed. Attack Up and Attack Speed are offered more often than the other cards. Numbers and some details come from the current development build and may change before launch.