Demon Lord's Reincarnation

Ren stepped outside of the portal and the first thing he saw was a gigantic door made of bones. The bones on the door were made from different species from humans to dragons. The aura the door emitted was that of the purest form of death energy. If that wasn't creepy enough the sounds of screaming souls could be heard from the other side. 

Ren and his companions could feel a lot of powerful energies being gathered beyond the gate. It was at that moment Ren also noticed another door beside the door of bones, it was a door made of pure energy. The energy emitted by the door was like a combination of Ren's mana and Spirit Aura, coupled with multiple other kinds of unknown energies. It was the purest form of energy and Ren had sensed something similar before.

It was the same form of energy that the original incarnation uses. Ren then looked around if there was anything else but there was nothing. 

The surrounding area was nothing but darkness, he couldn't even tell if he was above ground or underground as the only light source was coming from the door of bones and the door of pure energy in front of him. 

"Why is this so different from Leo's memories of the underworld?" Ren asked Silika who was standing in front of the group. 

"Oh, that memory when he saved me... That's because that entrance to the underworld was located on the planet. That was the entrance that recently dead souls use. This place is in an entirely different dimension. These two doors are where souls who have finished their initial journey from their respective underworld arrive at. After the soul has been judged by their respective Gods of Death they are guided to this place and will stand in front of these two doors. If you have accumulated too much bad karma then the door of bones will open for you." 

Silika pointed at the literal door made of bones. It was as if the souls behind the door could hear her, since the moment Silika pointed at the door the wailings of the souls grew louder. 

"Behind that door no matter how powerful you are, may you be an Ethereal or a Dragon, you will never be able to escape and will be tortured until your soul has paid for all their sins. Once all of the sins have been paid you will be allowed to have your soul cleansed." 

"Hmm, that's interesting, then what about Gods or the world deities could they also be unable to escape from that place?" 

"World Deities will never be able to enter that door and upon death will have their soul cleansed automatically and once again enter the cycle of reincarnation. As for Gods, any form of God up to Demi-Gods will upon death cease to exist. The reincarnation system does not apply to any God, from the lowest Demi-Gods to the strongest Ancient Gods. Unlike us, if they die their very being disappears and turns into nothing. Well, it's not like it's easy for them to die in the first place." 

"Alright, then what about the other door?" Ren pointed at the door that was made of pure energy. 

"That is the door of cleansing. Those that have accumulated enough Good Karma will be weighed and those that have accumulated greater amounts will be blessed with a better life upon reincarnating. Everything about the person will be cleansed here it usually takes around a century or two for a soul to be cleansed depending on how much that person has experienced. Once it is cleansed the soul is then sent somewhere in the universe to live its next life." 

"Alright, thanks for the explanation, but why are we here? Shouldn't we be back in the underworld of our own world? You do know why we've come here?" Valdel finally interjected. Silika looked at Valdel and sighed before answering. 

"I know why you guys want to go to the underworld, which is why I brought you here. Too much time has already passed and Lisa's soul has already passed the initial stages so she is no longer in the underworld of our own world. She has entered the next phase and has already entered the door of cleansing." 

"Does that mean... We're too late?" Valdel asked his voice almost cracking. 

"No, since she just entered the door of cleansing she's still at the beginning phases. Like I said cleansing a soul takes a minimum of a century."

"So that would mean we can still save her soul, and bring her back?" 

"Now that's complicated. Only Gods of Death that have fully comprehended the laws of Death can enter these rooms while alive. In this universe, there are about five of those, and only they could open those doors, and the only time they do that is in case a mistake is made. If one of the Gods of Death makes a mistake in their judgment of one's Karma they will ask one of the five to open the doors. Unfortunately for us, those kinds of mistakes don't happen very often, in fact, it barely happens at all." 

"Then how are we supposed to enter and save Lisa?" Valdel gritted his teeth frustrated that he was here just one door away from saving Lisa but he could do nothing. 

"What if I force my way in?" Ren spoke as his mana rose. 

"That won't do, if you were at the level of Leo or those stronger than him then sure it would've been possible, but the current you is not strong enough." When Ren heard Silika's reply his mana grew even stronger as he released even his Spirit Aura. A vicious smile appeared on his face as he summoned the death scythe Silika was holding. 

"Even so, you won't know unless you try." The needles at the end of the death scythe punctured into Ren's skin and started sucking his blood. Ren offered as much blood as he could possibly give without making him feel sick. The people that were with him stepped back, except for Tsukiyomi. 

"Tsukiyomi, support me!" 

"Very well!" 

The full moon mark on Ren's chest started to glow even brighter, as Tsukiyomi supported Ren with her power. 

Ren's mana turned blood red and covered his entire body like a cloak. A silver aura also surrounded him as the image of a silver moon appeared behind him. 

"Silika give me everything you've got!" 

"As you wish." Silika empowered Ren with her own energy as she merged with the Death Scythe.

The power Ren was now emitting was the most he has ever used in his entire life, past and present. This was his strongest form, and he was about to unleash his most powerful attack. 

The Death Scythe Ren was holding with his two hands started to be enveloped by Ren's blood-red energy and silver aura which was formed from the numerous energies that reside within his body. The blade of the Death Scythe started to enlarge and looked extremely menacing as an aura of death and destruction came out of it. If Ren had used this move on the Goddess of Light, it would've been absolutely certain that he could have wiped out not only the body of a world deity but even her true soul would've ceased to exist. 

"Now let's see if I can't break the door with this!"