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Upon reaching level 20 (tier 7) heroes gain access to an especially powerful set of talents that massively improve the power of your heroes, called Storm talents. For all heres Storm talents provide an upgrade to your chosen level 10 (tier 4) Heroic ability, and then usually have an option of 1-3 alternate talents. Notable exceptions being Alarak who can choose his other Heroic option, and Tracer whose heroic is gained at level 1. These talents are extraordinarily powerful and can be complete game changers, so much so that fighting a tier 7 team with tier 6 is ill-advised.
There are a few generic Storm talents shared across heroes: