Lizardmen War

The Lizardmen War was a conflict between the Great Tomb of Nazarick and the Lizardmen Alliance. Initially orchestrated by Nazarick to massacre the Lizardmen and turn them into Undead, they later decided to conquer them instead.

Background
To strengthen Nazarick's military force, Albedo had suggested using the corpses of the newly located Lizardmen, as there is a better chance they might create more powerful undead than using human corpses, who are fairly weak. In that end, Nazarick turned its attention to the Great Lake. An undead emissary was sent to each of the five tribes of Lizardmen: Green Claw, Red Eye, Dragon Tusk, Sharp Edge, and Razor Tail. The undead gave the Lizardmen an ultimatum from its master the Supreme One of their impending destruction. It was declared that in eight days' time they all would perish before vanishing.

Though the Lizardmen's morale initially to plummet due to the overwhelming power of the appearance of the undead, one of the Lizardmen from Green Claw, Zaryusu Shasha a Traveler, proposed that the tribes unite together in order to survive. Green Claw having already made allies with Sharp Edge and Razor Tail in a previous conflict, commissioned Zaryusu to entreat the other remaining tribes into the alliance. Zaryusu having reached Red Eye, fell in love with its chieftain Crusch Lulu, who agreed to the unity of the tribes. Dragon Trusk was also brought into the fold after the Traveler earned Zenberu Gugu's respect through a duel.

All the tribes gathered at Green Claw for a meeting to mount a plan of defense and attack for the coming war with the Supreme One. The tribes then began to make preparations such as building fortifications for themselves and training for the battle.

First Battle
At the appointed time, the Army of Death emerged from [Gate] with 4,950 strong undead. In comparison to the Lizardmen Alliance who numbered 1,380 people, the battle had the odds of three-to-one. Cocytus who was designated as the General of the undead army. However, he was given specific rules from Ainz Ooal Gown. The first rule was Cocytus was forbidden from setting foot on the battlefield. The second rule was his elder lich he was given to command the undead was to be used until the end. The third rule he was to think independently on this campaign. Cocytus keeping these directives in mind directed his orders via Message Scrolls and gave the order for his forces to march on the attack.

Upon seeing the approaching army, the tribes enacted a ritual ceremony uniting the tribes in great fanfare forming the Lizardmen Alliance. The lizardmen and undead armies advanced upon each other through the wetlands. The zombies and skeletons that were the first to advance drew apart due to their varying physical constraints. The first engagement thus was with the skeletons and lizardmen who employed no formations but simply crashed into the undead. Led by the five Head Warriors, who were backed up by 89 armored warriors from Razor Tail, they charged at the skeleton horde as a single united wall. The lizardman squadron tore into the skeleton horde, having an incontestable advantage in the first engagement. The skeletons being made of bones were easily crushed by the lizardmen with their weapons and protected from the undead's rusty weapons by their tough scales. While some lizardmen were hurt, nobody sustain fatal wounds. From the first charge 500 skeletons lay in fragments. Cocytus watching from his station was astonished by the display as the demi-humans had exceeded his expectations. Understanding that the skeletons and zombies would probably only serve to sap the oppositions' stamina, the outcome of the battle would still be in favor of the lizardmen. Having only an effective troops of 300 Undead Beasts, 150 Skeleton Archers, and 500 Skeleton Riders the weight of numbers were now against his army. Seeing that the state affairs were not good the Floor Guardian made a decision to draw out the battle to wear the lizardmen down. Using a Message Scroll, he sends out a command to the army's commander.

On the other side of the battlefield, the chieftains begin to look at the undead's battle strategy with suspicion. The reason is that the undead are not mobilizing effectively against them. Some inquire perhaps the enemy is looking down on them, but this proves to be the lizardmen's advantage as they are winning. They suspect that the undead army has no commander to give orders, instead of relying only on numbers to obtain victory. Still preparations were going well on their side by their druids led by Crusch Lulu and were confident that their unity would prevail.

The skeleton riders then began to move en masse. Seeing that the mobility of these undead would be a problem, the chieftains decided to respond accordingly. Just as the riders were circling the Lizardmen on the battlefield they fell into traps laid out by the Lizardmen Alliance. Exposed and on the ground from their mounts the skeletons were eliminated one by one using throwing stones. The battle situation had then begun to change, the skeleton archers launched volleys of arrows at the melee. Not expecting the hail of arrows, many lizardmen were hit forcing themselves to divide between blocking the projectiles and fighting the undead. The skeletons were immune to piercing damage were not hurt. It was a near-perfect strategy, but the undead had used it too late and the lizardmen rushed through the firing area, ignoring the passing skeletons to target the archers. Thanks to their thick skin and scales, the lizardmen were able to go through with minimal casualties. The archers without any orders to adjust to this tactic only kept firing at the enemy until they were drowned by the rising lizardmen tide.

At this point the only undead left on the battlefield still active were the zombies, with most of the skeletons beaten to the ground. Cocytus's command eventually reached the zombie beasts that began to flood the battlefield in a huge uncoordinated formation. The attack from below was unexpected by the lizardmen who now had to contend to undead tearing at their legs. The increasingly fatigued demi-humans were now pressed against defending themselves from these attacks. Those too slow were mauled to death by the beast zombies. The Head Warriors who had led the lizardmen on the front lines were now being pressed back. Just as they believed the line of battle would break, the ground before them swell, revealing two Swamp Elementals summoned by the druids. Acting as their trump cards, the summons charged into the zombie beasts and attacked them with their tentacles. Both entities knew no pain, but the battle went in favor to the elementals on strength rekindling the lizardmen's courage for another charge.