Heroes VII

After watching the video, I was left wondering which war the knight intends to end, and why he needs necromancers, orcs, and demons for that purpose.

The plot is as follows:
A civil war is raging. Ivan doesn't know how to fight, so he summons advisors from different factions. In their respective campaigns, they tell him about their faction, about some great event, about the peculiarities of their faction, about tactics, and so on. And in the last, seventh campaign, you will have to choose which advisor to follow and how to conquer the throne. (In the 7th campaign, the plot will already revolve around the civil war itself. In the other campaigns, the plot will not be related to the civil war and will tell about some glorious times of their faction).