This is third released DLC for Cossacks 3 and from my understanding it was not originally planned or something, so this is why it is not included in Deluxe edition. But anyway, it adds a new Scottish campaign and since the DLC campaigns of Cossacks 3 lack balance issues which present in original campaigns of the game, this DLC is a must, of course. Scotland also has very unique gameplay, which must be noted.
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