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Buildings such as the merc compound, turrets and even units like the wraiths and medics among many others are only available in the campaign. Either the battle you watched was simply a custom map, or was showing you a campaign battle. Protoss and zerg will get their own single player only units when their campaigns get released.
Buildings such as the merc compound, turrets and even units like the wraiths and medics among many others are only available in the campaign. Either the battle you watched was simply a custom map, or was showing you a campaign battle. Protoss and zerg will get their own single player only units when their campaigns get released.