Talk:Heroes/@comment-24.145.81.204-20141016104953/@comment-3241231-20141016162343

So far, it comes down to this: heroes are no longer unique, and you can have multiple copies of a hero. At the moment, you can only get duplicates of chest heroes though.

If you have multiples of a hero, you can promote it, giving it an extra star, and boost its stats and possibly its ability (if the ability scales). Each promotion requires more copies (1 for 2 stars, 2 for 3 stars, 3 for 4 stars), with the maximum copy being four stars right now.