Army of Death

The Army of Death (死の軍勢) was a group of low-level undead that were commanded by Nazarick's 4th Floor Guardian, Cocytus, during their war against the lizardman tribes of the Great Lake.

Background
The Army of Death was primarily composed of many low-leveled POP undead creatures which are automatically spawned from the Great Tomb of Nazarick.

The Lizard Man Heroes Arc
Cocytus was ordered by his master Ainz Ooal Gown to take charge of leading the undead army of Nazarick and used them to wipe out the lizardmen located in the Great Lake. Seeing that his own army is about to be defeat by the lizardmen, Cocytus began to seek out a request from Demiurge. Left with no other choice, he deploys his trump card the sub-commander Iguva=41 onto the battlefield. When Iguva=41 got killed off by Zaryusu Shasha and the Lizardmen Alliance had triumphed over his undead army, Cocytus accepts his defeat and that his mission to annihilate the lizardmen was a total failure on his part.

Strength
The undead army consisted of a total of 4950 undead monsters, not including the commander and their retinue.

The army is composed as following:
 * 300 Undead Beasts
 * 2200 Skeletons
 * 150 Skeleton Archers
 * 100 Skeleton Riders
 * 2200 Zombies

Trivia

 * In the Web Novel, the Army of Death was estimated to be bigger in numbers as it consisted of 5720 undead monsters. Among that amount, there were 2500 zombies, 2500 skeletons, 400 Undead Beasts, 200 Skeleton Archers and 120 Skeleton Riders.