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Standard advice: it's worth downloading and reading the Defenders of the Realm FAQ. Here's what it has to say:
DotR FAQ wrote:
Do hero abilities apply even when it is not their turn? Specifically the Eagle Rider and the Sorceress joining in a battle with a General?
When the Heroes are activated as part of a group attack, they can use their hero skills if they are viable against the General. Since the Sorceress can only change shapes at the start of her turn, she could not change shapes when activated by another player as part of a team attack, but would stay in the current form and if the General is of that race would get her +1 against the General...