There are a few stats of heroes that you can upgrade to make your heroes more powerful:
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Hero’s Stars
You can upgrade hero Star level by collecting hero shards in different game activities, such as Tournaments, Expeditions, Campaign missions, opening Crystals and buying Herostones in in-game Shop using in-game currency .
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Abilities
You can upgrade hero's abilities using Ability Scrolls. These scrolls can be collected in various game activities, such as Campaigns, Events, Challenges, Tournaments, and they are also available in the Shop.