Whats the last part?

[Rygaros]

Hi,

I'm just done with the land of death.
The mainquest now proceeds to the Orcs. Are they the last part in the game or is it the demonland? Because if demonland just is an extra area I don't wan't to miss it out.

So without telling me to much what comes up, should I go Orc or Demonland first?

[Saridu]

You have to go to Demonis and seige at least one of the castles as part of the main quest.