Heroic Abilities

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If an ability has a Heroic Resource cost to activate—as in, you can't use the ability at all without spending some of your Heroic Resource—then it is a heroic ability. If an effect allows you to use a heroic ability when it isn't your turn, you must still pay its Heroic Resource cost to use it unless the effect says otherwise.

Some abilities don't cost your Heroic Resource to use but allow you to spend your Heroic Resource to enhance or add effects to the ability, such as the conduit's Healing Grace. These abilities are not heroic abilities unless the baseline ability can't be used without spending your Heroic Resource.

Source: Draw Steel: Heroes · printing 1.01b