No one knows for certain exactly where or how Death acquired such a massive army. Whether he rose them directly from their grave or created them himself, one thing is known for certain: it seems as though he has an unlimited supply. After each battle, large or small, he adds more men to his ranks. It is also known that no two undead look exactly the same, but they are divided into basic categories depending on their roles in combat.
About this creation
First up is the Ranged.
They are equipped with anti-air weaponry which can also be turned on foot soldiers.
They have no armor on their backs, but getting behind them would mean fighting your way through undead, for they stay on the back lines.
One characteristic about them that makes them especially deadly is the fact that they can hide behind cover then extend their legs to fire and remaining nearly unhittable.
Next is the Berserker.
These guys fearlessly charge into a fight, relentlessly tearing through soldiers using whatever weapons they can find.
They are heavily protected from the back to prevent them from being back-stabbed.
This particular Berserker smartly chooses to make both uses of his weapons: one has the blade facing forward while the other has the saw facing forward.
Lastly, there's the tank.
They take the brunt of an assault while the Berserkers and Ranged do the real damage.
Ironically, they have no armor whatsoever. Rather, they rely on their heavy shield that's created by the coils behind the head.
However, they are still a major threat as they possess both a range and melee weapon.