This is good!

Hmmm... the system is kind of basic, but it's a very OP system. No time for explanations, the quick summary is, Exchange souls with the system and gain anything you want. There is no status, no nothing, If I want a status, then I will have to buy it.

The system asked me before whether I would like to trade in souls or whether in sacrifices. I chose souls, it's the more convenient option.

*Shriek* Shriek* 'Is that a little demon coming to kill me?'

Let's see, there are approximately thousands of these little guys here, "THIS IS GOING TO BE FUN!!!"

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3RD PERSON POV:

In the vast expanse of the island, thousands of little demons can be seen, every single one is going on a carnage, trying to feed on the souls of other demons, but there is one who is just standing there sitting quietly, the only advantage he has is, his egg was placed on slightly higher ground. His name is Samael, while his full demon name is unknown, every demon has a full name, and by gaining knowledge of their full name you can control them.

A demon thrives on souls and the purity of his bloodline, while some may think that why does blood matter, but the thing is that a purer bloodline grants a stronger connection to bloodline magics.

While Samael is lost in his own thoughts, his opponent comes toward him with a shrieking sound, the little demon keeps running toward him and suddenly falls down, with blood leaking out of his throat, everything just happened too quickly.

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Mc's POV:

Was that a fucking Narrator's voice? You have got to be shitting me, I think I'm in a fanfiction or something. Anyway, the beast coming at me is a dumb one, his whole body speaks of urgency and irrationality. I just sidestep a bit and using my sharp claws, I simply rip out his throat, thank Go-, shit I just made a mistake. Wow, this little body has some strength. According to my calculations, I am currently in the world of the Custom-Made Demon King, and the original mc must be around.

Let's put the soul of that beast, to good use. System strengthen my claws and use the whole soul for it.

One moment later:

Hmmm... my claws are twice as strong, I think this is because the beast was on the same level as me, If I want to double the sharpness of my claws, it will take one more soul. But if I want to strengthen my claws, then it will need four souls. I think nit is pretty balanced.

"Let the carnage begin!" *Shriek* *shriek*

'It came out as a shriek again', I have to stop doing that.

30 minutes later:

I have harvested almost 260 souls, I think, it's time to find Osiris, I have to kill him as quickly as possible, I have nothing against him, but a being with a system of that caliber is extremely dangerous variable.

But first, system, increase the overall capabilities of my body by 6 times and using the remaining 4 souls, give me a soul counter.

1 minute later

Well, now I am six times as powerful as a little demon, and I can now easily keep count of the souls I consume. Well, let's move towards the demon with a cloth bag in his hand. There he is, the amount of power he could've wielded if he had been smart. Alas, there is no need to ponder over the idiocy of incompetent fools. I move silently to his back and *crack* break his neck. Poor soul just got a new chance at life, but I took that from him.

Okay, now I have to move towards the upper level of the abyss, my inherited memories are screaming at me, but not before blocking the entrance and harvesting some souls.