After I destroy the last portal of the world the boss of the tribe of the spora apear.

I want recruting some soldiers and resource to get there and whe i got to the place there is a fortress but no portals or structures to and somehow the portal on the map also disapear.

I'm not sure if i completed the game but for sure it was a big bug because the all the structures of the forstres disapear there is no portal left so I can't do anything now.