I split the savegame into two.
The first is to be used if the second fails.
I got through bharga by sneaking through the main floor of the leaders fort. I used 2 members of my party to distract them while 1 opened the gates, and the other slipped by. Once I slipped by the 3rd closed the gate. The 3 in bharga died, my forth is alive which was able to get away and use return life.
Then the spiders... Used same tacts but threw in summoned creats as well. Now I am trying to make way to dragons gate but am stuck between thunder pit crawlers shamblers and ghosts.