Apart from wanting the world to end and having the bad guys win this time, I really hope it's not the same cliché whisper and mindcontrol thing. Like... they can do that, but not with the important people. I'd like to see something along the lines of N'zoth throwing us some bait here and there and bringing his own minions into place for the time when everyone is at each others' throats because of their own 'bad' feelings (rage, revenge, greed, fear).
Behind everything that goes down because of this, N'zoth makes the simple people join him. Farmers, footmen, beggars, bandits, everyone who ever felt screwed over by the heroes and royals in the world.
And when we need an army to fight back against his last move of coming to rule the world, we have none.
Oh man, I'd love this.
Sorry