Demon Lord's Reincarnation

A few months after the human alliance was formed they were about ready to march towards the canyon to the demon lands, which was now called the canyon of death. 

The Lycan scouts that were waiting near Touma City noticed that irregular movements. They wanted to go closer to check on it, but they couldn't get to close as they sensed that there was someone in the human camp that was at the same level as a demon lord. 

So all the could do was wait for something to come out of the city. Once they saw the sight of the human army moving out, one of Lycan scouts quickly turned into his wolf form and started running back to the demon lands. 

...

The Human Alliance moved rather slowly in the canyon as the wyvern riders took the lead to scout the area. In their current speed, they would reach the end of the canyon within a day. 

As the humans were walking through the canyon, the soldiers of each kingdom were watching each other closely. Even though they had formed an alliance to fight the demons, they were enemies just recently. They couldn't help but show distrust with one another. 

Not only did they need to be wary of the demons that they were about to fight, but they needed to be wary of their allies as well. This was the best chance to eliminate the forces of the other kingdoms. 

...

Back in Kretos's castle, the Lycan scout reported all that he saw. It had only been several months since their last attack. The humans had lost that battle quite badly and now they came back with an even greater force. Kretos smiled happily as he heard each word of the report. 

"These humans do not know when to give up, I like that." 

"So what do you plan to do Kretos?" Tsukiko asked while brushing one of her seven tails. 

"Do you even need to ask? Of course, I'm going to have some fun." As Kretos was getting ready to go, Tsukiko sighed. It was at that moment the new person at Kretos's side knelt before him. 

"My lord, please allow me and my men to take this battle." Namor continued to kneel waiting for Kretos's answer. 

'Well, I guess I do want to see how strong his undead army is. I could always join the battle whenever I want. Might as well give Namor the opening act.'

"Alright Namor, show me the might of the so called strongest general of the former demon king." 

Hearing Kretos's response Namor stood up and saluted Kretos. This was Namor's chance to show Kretos that it was worth it to keep Namor and his army by Kretos's side. 

"I shall not disappoint you, my lord."

...

While the human army continued to march forward the sky was growing darker and darker. A few minutes later it started to rain heavily. Some of the soldiers were feeling a bit out of it as it continued to rain.

"What the heck, it started raining." 

"This seems to be a bit ominous."

"It's not ominous, don't you remember who is here with us. This is a blessing from one of the Gods." 

"What are you saying?" 

"Did you forget? The hero is from the temple of the God of water." 

While the soldiers were discussing the sudden rain, the area started to fog up a bit. It got harder to see ahead so the march became slower. 

As the fog was becoming thicker one of the wyvern riders saw something flash at a distance. He went nearer to see what it was, but then without warning an arrow had pierced his head. One of the wyvern riders fell from the sky. The others haven't noticed yet, since the fog was too thick, but then one after another the wyvern riders started falling from the sky. 

"What is happening?!" 

The surviving wyvern riders quickly retreated. The army stopped moving as they looked onward to see what was attacking them. From within the fog, a frightening sight came forward. 

Numerous people wearing armor came forward but they had no eyes nor flesh. Each move they made had the sound of grinding and clicking bones. These beings were nothing but walking bones wearing armor and holding weapons. 

Behind these skeletal warriors were headless horsemen. Riding black warhorses, with a whip on one hand and a sword in another. Upon closer inspection, one would see that the whip was the spine of a human. 

If that wasn't enough to frighten the human soldiers, there were also skeletons with a bit of flesh left floating above the ground cackling. Unlike those skeletal warriors, these beings had an immense amount of mana. Surrounding this ominous group were ghost-like figures. 

Then there were the most fearsome beings hidden at the rear, massive beings wearing heavy armor and holding different weapons. The aura this group of armored beings emitted was an aura of death and despair. 

The human alliance was unnerved by the sight of these ghastly creatures. Some of them had started shaking in fear. Some even threw up at the sight. The atmosphere grew tense and the only sound that could be heard was the pitter-patter of the rain. 

"UNDEAD! Why are their undead here?!" One of the commanders shouted breaking the silence. No one had an answer as most of the soldiers started panicking. Before they could even fight the demons, they had to fight this army of undead. 

As the humans were trying to calm themselves down, someone came out from within the undead army. It looked like a normal skinny man wearing an armor made of bones. 

"Humans! Hear my lord's decree, he has given you one chance. Retreat now or face annihilation!" 

When the humans heard Namor's declaration they came to a realization, a very scary realization. One of the commanders told a mage to help him enhance his voice to reply. 

"Who is this lord of yours?" 

"My lord is none other than the strongest demon lord, demon lord Kretos!" Namor proudly declared. 

When the humans heard Namor's reply they were stunned into silence. The demons were using the undead as minions!

"What are you demons doing?! To even use the undead, as expected from such an evil race." Another one of the human commanders responded. 

"Who are you humans to judge us demons as evil. In my eyes, you people are the ones who are evil. To come here and invade our lands, and dare say that we are the ones who are evil! You are the ones who attack without being provoked, you humans are such a wretched race!" 

"How dare a demon who controls undead call us wretched!" 

"Enough of this banter! You filthy humans, since my lord doesn't like to fight weaklings like you he has given you a chance to live. If I were you I would accept my lord's kindness and leave, never to return to these lands. Decide now retreat or die!"

"CHARGE!" The human commanders could no longer hold their anger and gave out the command.

The warriors started charging forward, even though fear has gripped their hearts, they moved onward. In their minds, this was for the sake of humanity, for the sake of their families. If before they were a bit reluctant to attack the demons, but now there was no more hesitation.

To the current era, it was common knowledge that the undead would kill all the living. It was just a matter of time before the demons could no longer control the undead, and seeing how large this undead army was, meant that if they lose here their families would die later. 

...

Watching the humans charging towards him, Namor shook his head. "As expected, even after all this time humans are still fools." 

Namor then looked at his army and shouted. "It is time to show demon lord Kretos our worth! Show these humans the cold embrace of death!" 

Upon giving the command the undead army started charging forward meeting the human army in battle. 

...

The mages from the human army had gathered in a group and started chanting. They were bombarding the skeletal warriors with mid-tier spells from afar.

The wyvern riders started attacking with fire breath, as they couldn't get close. The moment they were within the range of the archers they were easily shot down. As they bombarded the skeletons from afar, they noticed the ghostly figures approaching them.

The wyvern riders tried attacking with their swords but it only phases through the wraiths. Some had the idea to imbue their weapons with mana which were able to harm the wraiths for a time. Yet after a while, the wraiths were able to evade their attacks. The wyvern riders were dwindling at a fast pace. Since the beginning, the undead army seems to be concentrating their power on destroying them. 

'Once we take down their aerial superiority, it would be easier to deal with them.' Namor was watching everything from a distance as he commanded his undead. Each move the humans made he would counter, using overwhelming force. 

...

As the battle continued on, a few hours had passed and the humans noticed that while their numbers were dwindling, the number of undead was increasing. Once one of them dies the elder liches would immediately turn them into their minions. 

As the moral of the human army was decreasing, someone gave out a command from the rear. "All units retreat!" Once they heard that command no one hesitated and immediately retreated. After the humans retreated at a certain distance, a man holding an ax came down from above and started destroying the skeletal warriors at the front. 

"You demons that took everything from me, it's time for me to take everything of yours!"