Demon Lord's Reincarnation

In a universe different from Ren's own universe in a dimension hidden from what can be observed a grand battle was taking place. One of the Old Gods was fighting a group of mortals in his own dimension. 

The Old God was in his true form and was the size of a planet while the opponents he was facing were smaller than ants in his view. Yet these small insignificant beings had wounded him so. At the moment the Old God had the advantage but his body was already filled with numerous bruises, cuts, and burns. He an almighty being that could wipe out planets with a swing of his hand was having difficulty fighting a bunch of mortals. 

On the other hand, the mortals he was facing were now on the ground some coughing out blood, others were bleeding badly, and the remaining ones still standing were trying to heal all the injured. 

"Do you see now, you are no match for me. It's already an amazing feat for mortals such as yourselves to be able to stand in my presence, not to mention wound me. Be proud for doing the impossible, and die without regrets."

The Old God lifted his hand and a planet-sized ball of energy appeared. If it was anyone else that witnessed this scene they would have already felt despair overcome them, yet these people were smiling ever so brightly. The Old God saw their smiling faces and was confused, he then remembered a certain individual who would always smile in the face of overwhelming odds. 

'He can't be here, I have already confirmed with the other Gods that he's in a different universe at the moment.' 

"Why are you smiling, have you people gone crazy, or do you find your impending deaths amusing?"

The hundreds of people who were fighting the Old God looked at each other and started laughing. The Old God frowned as his voice boomed.

"Are you mocking me?!" One of the people who could still stand stepped forward. He was the leader of one group that were using two short swords as weapons. 

"Old God we aren't mocking you, this is the greatest form of praise our clan has to offer our opponent. I'm sure the other clans are of the same mind. One of the teachings from the founder of our clan has taught us when in a tight spot, and when victory feels so far away then that's the time when you should smile."

"Hmm, that sounds familiar... Who's this founder of yours, if you lot are from different clans how come you have the same teachings?" Seeing as he could kill them whenever he wanted at this point, the Old God decided that it won't hurt to learn more about these crazy mortals before ending them. 

"We might be from different clans and from different parts of the universe, but our founder is one and the same person. We are the Descendants of the Strongest Mortal Soul. My clan specifically are descendants of the one nicknamed the God of Battle, Death, and Victory, the mighty Leonard Tranor." 

Another one stepped forward this time it was from the group that mostly used spells and potions as they fought. 

"Our clan is also Descended from an incarnation of the Strongest Mortal Soul. We are the descendants of the one that sought to unravel the mysteries of everything in existence, the one they called the Eternal Sage, Cry Loder." 

Then another one stepped forward it was from the group that uses spears and halberds. Among the different clans, they were the most muscular. 

"We too are the Descendants of an incarnation of the Strongest Mortal Soul that was hailed to have the most powerful body even among all the other incarnations. With his left hand, he lifted a planet, and with his right hand, he wielded a spear that could pierce through the heavens themselves. The Thundering Guardian, Atlas  Raybach is our founder!" 

Then last among the clans, their representative stepped forward. This clan had fought using nothing but their legs and fists. 

"We as well are the Descendants of a mighty incarnation of the Strongest Mortal Soul. His body was that of steel, his fists and legs were weapons that could destroy everything in its way. We are the descendants of the one whose name made all tremble in fear, the star crusher, Hanayame Ryuji." 

The Old God was surprised to hear the names of rather powerful incarnations of the Strongest Mortal Soul being mentioned. Two of which were powerful enough to easily kill Old Gods such as him as if they were children. Leonard Tranor and Cry Loder even among the powerful incarnations of the Strongest Mortal Soul, these two were in a different league than the others mentioned just now. 

"I see... So that's why... Still, even though you are his descendants, you guys are nothing much compared to the actual Strongest Mortal Soul. If he was the one facing me, I would've already fled." 

"Which is why we are the ones to face you. We already know most of you Gods are cowards that would no longer face our founder in direct battle. So to lighten his load as he would once again fight the oppressor who calls himself the ORIGIN, we as his descendants are willing to eliminate those that would get in his way." 

"Hmph, you talk as if you stand a chance. Well, talk is over it's time for you to depart." Once the Old God spoke those words he was about to drop the planet-sized energy ball on them. The leader of Leo's descendants spoke to one of the descendants of Cry. 

"Are you guys still not finished?" 

"We need a few more minutes to activate the spell." 

"Tsk, I guess it's time to die. EVERYONE! Do your best to protect the mages!" All of the descendants that weren't part of the Sage's clan stood in front of the mages and used their strongest defensive skills. 

The planet-sized energy ball tore through the initial defenses easily but then it slowed down and grew smaller. The planet-sized energy ball was able to kill all the other clans except for the Sage's clan. 

The Old God wasn't expecting that and was about to initiate another strike, but before he could do anything a beam of pure mana flashed by. The beam of mana had easily pierced not only his physical body but his spiritual essence as well, this one strike had killed him almost instantly. 

The members of the Sage's Clan all fell to the ground lifeless, they had used all their mana and life force to make that attack succeed. The four clans had sacrificed a large number of their people but in exchange, they were able to take down a powerful Old God. 

...

In Ren's soul realm, the Original who was sitting in front of the infinitely growing board saw the piece that the ORIGIN moved disappeared, but all the hundreds of pieces he had moved disappeared as well. 

The Original gnashed his teeth as his heart bled for the sacrifice he just made. Still, he needed to continue on, and no matter what he must achieve victory. 

"I'm sorry and I thank all of you for your sacrifice. May your proud souls reincarnate into a better world."