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They weren't expecting the sixth installment of the series back then. There simply wasn't enough time, and that's the whole answer. They didn't even have time to create a fifth mission for Zehir – a true finale – and include it as an empty map in the editor.
You need to pay close attention to the dialogues. Any character in the fifth game could "accidentally" mention Railegh.
You need to pay close attention to the dialogues. Any character in the fifth game could "accidentally" mention Railegh.
Whatever