The Bandos Godsword can be one of the few Bandos items obtained through killing General Graardor at God Wars.  In order to get to him, you must kill a mummy and then you will be teleported to him.  Be warned though, as pkers frequently camp around the area and kill you the moment you spawn there.  It is advised to go to the Member's shop if you can to buy one. There is a bug though, that after you wield the sword and take it off, it becomes a null. This may have been fixed to an extint. It happens less often.