Wel, thanx for the help, but in the meantime I've finished it with a lot of running ang shooting those bastards around Golem with everything I had..
You didn't mention anything about turning on these generators around the field,.well,..I did it..!!, and when my left hand started to burn/ after a few nice headshots/ I launched my fireball attack which in combination with power from generators provided a great shock to golem,..two or three attacks like that and Golem is done,..
...P.S. Demon crusher level.