When promoting a hero, how to increase his ability's rank?

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Each hero has an ability with 3 ranks.

Hero's ability

During the promotion phase, you can increase stats by clicking it (on the right side of the screen), but I can't find how to increase the said ability: clicking its icon only opens its description.

Hero's promotion screen

Is it normal? Is there anything special to do in order to inscrease the ability?

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Epic Seven - All You Need To Know About Promoting [Guide]



Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Monstera, Julyo Saenz, Esther, Ron Lach

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