Tungsinn is barren with no buildings or quests.
 

So far months of playing this on and off i get to what i think is the last area of the game aaaaand... nothing? No buildings no quests, hell i can see smoke rising where i guess there was supposed to be a hut? I can see buildings on minimap but in game they are just green patches of grass.

I guess it's just a graphical glitch in relation to your gpu driver. Try to lower resolution and quality settings. Uninstall current graphics driver and install the latest driver.

hum i tried that it didn't work, i don't think that's my issue however. None of the other areas do this and i can physically walk and stand where a castle should be as if the map was loaded into the editor and the keep deleted.

Use Verify integrity of game cache in Steam, maybe you have some corrupted game files!

I did that too, i've even reinstalled since my saves on cloud =( i guess i'll just never be finishing this game which sucks. I purchased the whole set since this one was my first and i loved it but i'm just not going to play them if i cant finish this one.