Great Mothers Cron Counter

Slkr or kenobi can do it. You siphon enough with slkr with a good datacron, preferably the if you crit attack again cron, he’ll eventually one shot them. I’d throw in armorer and put three stack on the just to be safe. Kenobi, you gotta instakill the great mothers with Tano, then inflict healing immunity with kenobi on each of them one by one to kill the rest of them off.