There are two
incredibly difficult to defeat enemy
bosses to overcome in the form of Dr. Hans Volter who wears an Exo suit to provide him with superhuman strength and movement with a pair of assault rifles and gas grenades as his main attacks, although despite all of that he will still feel the need to suck the life out of any nearby character when his health is running low, while the Patriarch has a
powerful minigun and missile launcher in place of his left arm and healing syringes to recover health when retreating.