Demon Lord's Reincarnation

Ren looked at the six spirit rulers and showed his vicious smile. He was getting really excited, he has never seen any of the spirit rulers, but he has heard tales of them. Unfortunately back in his peak, no one was able to summon them. If Nezzard was living back in his past life, he would most probably become a human hero, if not he would still be a hidden master that would have challenged him. 

It was exciting to see the increase in Nezzard's mana, even counting all the humans he fought in his past life, Ren was sure that Nezzard has the greatest amount of mana he has seen a human hold. Still, having stronger mana doesn't necessarily mean you will win. Mana was just fuel if you don't know how to use it properly, then it's worthless. 

Ren then looked at each of the spirit rulers, each one of them was the peak of one element. The mere thought of fighting such beings made Ren tremble in excitement. 

...

After talking a bit with Nezzard, the six spirit rulers finally looked at their opponent. At first, they simply thought that Nezzard was overreacting. But when they saw the boy with an unusual smile on his face they changed their minds. The boy looked like any other human, but his mana and the way it swirled around him was frightening. Yet the moment when the six took a peek into his soul, they couldn't understand it, but they felt extreme dread. 

They didn't know what was happening, all they knew was that peeking into the boy's soul was not a very good idea. It was then the six of them finally noticed the one standing beside Ren. Unlike when they took a peek into Ren's soul, the six knew why they were shivering in fear at the very sight of this woman. Terror penetrated their very souls as they gritted their teeth. 

The Spirit Ruler of fire quickly shouted at Nezzard, while the other five stood at the front getting ready for a life and death battle. 

"Nezzy quickly summon the last spirit!" 

"Why?... Is Ren really that powerful that we need to call for her?" Nezzard was reluctant to summon the last Spirit Ruler since she was too powerful and summoning her always made him lose consciousness for months. 

"No time to explain, just do it! Once you summon her, run as far as you can. Teleport, dig underground, just do anything in your power to escape!" 

Hearing the Spirit ruler of fire who was usually so confident act this way, made Nezzard fully aware of how desperate the situation was. He no longer hesitated and poured mana into all his fingertips, and started drawing a magic circle. Unlike the six spirit rulers, the last one was a special being that needed a bit more preparation to summon. 

...

While Nezzard was preparing to summon the last spirit ruler, the six already summoned Spirit Rulers stood in front of Ren and Silika with the determination to die. They might not know who Ren was, but they knew who was beside him. 

The one beside Ren was none other than Elizabeth Rogue, the former Goddess of Death. Unlike the humans that have been forced to start over, and had zero recollection of the past beyond the reset. The Gods and Goddesses knew of the events that transpired, so do the Spirit Rulers. Since unlike humans these beings were one with the world, and as such as long as the world remained the same, they would be unaffected by such a change. 

So the Spirit Rulers, even though they weren't the Spirit Rulers at the time Elizabeth was the Goddess of Death they still recognize her. They were able to do this since they share the memories of their predecessors. With that knowledge at hand, they knew who and what kind of being was in front of them. 

Unlike all the others that took the title of Death, Elizabeth Rogue was a special case. She was without a doubt the strongest to have ever held the title of death. She was said to be so strong that even the other Gods of Death in other wolds feared her name. She was even given a special title among the Gods and Goddesses. At one point she was even considered as the Queen of the Gods.

To be facing such a being in combat was idiotic and suicidal, but their master has already started the battle and there is no backing out now. 

...

Ren noticed the fear in the eyes of the Spirit Rulers, but it wasn't fear towards him. They were looking at the person beside him. 

"Silika do you know these people?" 

"Not really, the Spirit Rulers I knew of are long gone. Still, I heard each generation of Spirit Rulers share all the knowledge of their predecessors, so maybe they know me." Silika shrugged her shoulders as she answered. 

"Oh, what did you do to their predecessors that would make them react this way?" 

"I can't really remember..."

"Well, either way, if you fought alongside me I guess it will be pretty boring. Look at them, they look like they're ready to fight, but in truth, you already crushed their wills. Fighting them will only be a bore. I was already getting so excited only to see this sorry display."

The Spirit Rulers heard what Ren and Silika were talking about and it was clear they were mocking them, but they had no choice but to take it since the two in front of them had the right to be that arrogant. 

"Did you hear that? She won't join in the battle. So no need to be so nervous, just come at me and show me what you got." Ren gestured with his hands telling the spirit rulers to come forward. Yet even with everything he said, the six Spirit Rulers remained ever vigilant. 

"Tsk, so they still act like this. This is getting boring if you won't fight, then step aside." Ren clicked his tongue and spoke in irritation.. But before the Spirit Rulers could reply Ren and Silika felt another presence materializing and unlike the other Spirit Rulers, this one was much stronger.