Fantasy Assassin in a modern world

When Loki heard the system's voice he was stunned for a few seconds before he was able to respond. 

"Shera, are you Shera?" Loki could not help but tremble as he heard that familiar voice of hers. He knew it was a long shot but what if. 

"I'm not this Shera person. What you're hearing right now is the voice of the person that you trust the most in the world." 

When Loki heard that answer his killing intent started seeping out of him. His mana started to surge outward making the nearby bookshelves tremble. Even though the voice in his mind had no shape or form Loki looked like he was ready to kill it. 

"How about you don't do that?" Loki's tone was lowered which made him sound like he was growling. 

"Hmm, If you agree to activate the system then I would think about changing my voice." 

"Then disappear from my mind. I do not need a system, and I don't need some system that taunts me using my dead sister's voice."

"Then I'll continue to bother you with your sister's voice for as long as you don't activate the system."

"Are you actually threatening me?"

"No, I'm not threatening you, I just want you to activate the system." 

Loki clicked his tongue as even though he was frustrated and wanted to attack, there was nothing to attack. The system with the voice of his dead sister had no physical body to attack. It was at that moment Loki finally calmed down. 

"What kind of system are you?" 

"Are you finally willing to activate the system? Also, I'm not the system, I'm the creator of the system." 

"The creator of the system? Alright, then how come you're harassing me to activate the system, even though I clearly do not want to." 

"I have been in this world for a couple of millennia and not once have I seen a worthy host. None who have entered this library, have figured out its secrets nor were they able to read the books needed to activate the system. I have almost given up until you showed up. The mana circulating within you is the purest I have ever seen. Not to mention the books you just picked out could only be seen by those with a certain degree of mana. A few millennia before there were people who had mana come into this library yet none were worthy. I continued to wait, but nowadays in this era, the people of this planet are using a different form of energy that was not related to mana. Only those with mana could support the system I created, and based on the trend it's easy to tell that I won't be seeing someone like you anytime soon. So I want you to become the host of the system I have created."

"Wait if I remember correctly this library is just a few hundred years old, it hasn't existed for thousands of years like you claim." 

"That's because the library I speak of isn't this outer shell that you see before you. The library I speak of is myself. I am a fragment of the greatest library to have ever existed. I was a part of the Akashic Records, its soul, its spirit." 

When Loki heard the term Akashic Records he was stunned into silence. The Akashic Records was well known both in this world and in his old world, many stories of it exist in both worlds. It is said that the Akashic Records holds the knowledge of all events, spells, even emotions, and everything in existence from past, present, and future. The library were all knowledge is found, is said to go on for eternity. The Akashic Records have existed since the beginning of time, from the birth of knowledge. 

"So are you interested now in activating the system?" 

"Before I even think about that, what's the purpose of the system how shall it benefit me? Also, you say you're a fragment of the Akashic Records, does that mean there are other fragments out there?"

"I am the only existing part of the Akashic Records that has a spirit and knowledge, all the other fragments are simply objects that were once part of me... As for how I became a fragmented spirit of the Akashic Records, well In a place that was neither past, present nor future, the library that stored all knowledge was destroyed by an unknown entity." Before the fragment of the Akashic Records could continue talking, Loki interjected. 

"Unknown entity? I thought that the Akashic Records houses all knowledge, so how could there be an unknown entity?" 

"The knowledge stored in the Akashic Records is of all the knowledge in this universe from past, present, and future. The entity that attacked wasn't part of this universe which made it an unknown." 

"An entity from a different universe?..." Loki was being overwhelmed by the information he was getting. He was just a transmigrated assassin, this event that affects the universe was something beyond him. 

"The purpose of the system is to recreate the library that holds the Akashic Records, to once again make me whole. The system will help the host in gathering my missing fragments, a lot of which are hidden within this planet. Once I regain a bit of my power, the host will no longer be bound to the system and I will go my own way." 

"All I heard are things that would benefit you. Why would I want to activate the system, if there's nothing in it for me?" 

"There's of course a benefit to being bound to the system I created. Every time you find a fragment of the Akashic Records, you will be able to choose from a set of skills that are found within the part of that fragment's library of the Akashic Records. In fact, if you activate the system now, you'll be able to get one free skill that is within the current books I have in store. So what do you say?" 

"How many fragments are there in this world?" 

"Based on the last pieces of knowledge I have retained, there should be around twenty-eight fragments in this world. Once you acquire those twenty-eight fragments, I would have enough power to move around on my own, and I will search for the other missing fragments scattered around the universe. Also, just to sweeten the deal, even after your bond with the system is annulled you would still be able to keep the skills you have acquired from it. So what do you say, are you now interested?"

"Before I answer, can you tell me, is there knowledge within those fragments that could help revive the dead?" 

"The Akashic Records houses all knowledge within this universe, but as for the revival of the dead such knowledge is forbidden and upon accessing it, a calamity that would affect the entire universe will happen." 

When Loki heard the spirit's answer in the voice of his dead sister no less, Loki sighed. Such a risk even to revive his dead sister was not something he would take, as that would go against the ideals his sister stood by. Even if she were revived by such a method she would only blame herself, for the calamity that would ensue, for his sister that fate would be worse than death.

"Alright, just one final question, what will happen if I don't activate the system?" 

"If you don't activate the system, then I will be stuck here until another worthy host appears. Since in my current state I cannot leave this place. So my only option is to wait, and that could take an eternity, as it might never happen at all. You might be dooming me to an eternity of waiting."