I did this mission last night , it was an absolute killer and I officially hate the last word but managed to get it grinded out . Just equip last word when you have your super or heavy . Big maps with a sniper also help a lot ! . The shield brothers part also sucks , bring a good void weapon for the psions . You also don't need to get the killing blow , just do a bunch of damage in each brother with a shotty . Seriously I've pulled my hair out over this , I went back to it last night and started at 21 percent , the second part with shotty kills I got done in two crucible games . But yeah , the last word is the devil ! , I will never ever ever use that gun again and I used to main a handcannon ......