Alan
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If we're talking about completing the campaign in the third installment of Heroes, then it's quite straightforward... it takes about a week to complete all of them (The Restoration of Erathia, Armageddon's Blade, The Shadow of Death). The difficulty level in The Restoration of Erathia cannot be changed; in the others, you can set it to the maximum.
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.