Just think of de as if it is XP. If you hero does a good job of helping you attack you will get more de, if he does a poor job, you get less de. Once you have attacked successfully enough times you have earned enough de to upgrade your hero.
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Just think of de as if it is XP. If you hero does a good job of helping you attack you will get more de, if he does a poor job, you get less de. Once you have attacked successfully enough times you have earned enough de to upgrade your hero.