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A magical terrain is an overlayer that, in most cases, gives bonuses or penalties in combat. Except for the Favorable Winds, these terrains don't affect movement, but use whatever terrain is under them to calculate movement cost. They can cover all other terrain types except for rock. While there are only two kinds in Heroes III: The Restoration of Erathia and Heroes III: Armageddon's Blade, Heroes III: The Shadow of Death increases it to a total of ten.

These ten magical terrains are:

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