Heavy Nullmen, while not a boss, are significantly tougher than standard enemies and often appear in challenging arenas. They have increased health and can withstand more damage. Focus on headshots with powerful weapons like shotguns or assault rifles. Explosives are highly effective. If engaging in melee, use heavy weapons and aim for their head or try to disarm them. Utilize environmental objects to create distance or block their charge attacks. Don't let them corner you.
