After I killed the General of the Fallen Legion, together with 80,000 Fallen Angel Soldiers, they would lay low for the time being.

Still, I had to work very fast, as I didn't want to waste time, and if Ultimate-Class unprotected my territory for a more extended period of time, it might lead to some complications and attacks.

Germination of the new Heart took more than a week. First, I germinated it with my own DNA to increase the compatibility rate and used the bodies of many High-Class devils as biological material and nourishment.

Thanks to advanced genetical knowledge from the Age of Technology from my past life, and even knowledge from Aeldari, I was able to engineer a perfectly suited new heart for me genetically.

Also, getting more Hearts was an advantage for me, as most of the Demonic Energy was concentrated in the devil's heart. From the Book of Lucifer, I have found out that there existed devils with multiple hearts, mostly first-generation ones.

After the new heart was successfully germinated, I started working on the ritual that would be performed. It was a complicated one, as it required countless Abyssal Runes to create; laying out the runic matrix for that formation took me several days.

"Architect, with this Heart, what is the possibility of rejection?"

I asked as I was working on the Abyssal Runes to make final adjustments to the ritual.

[21,6982% that your body will reject. Decrease by 12,9005%.]

A decrease of around 12% to 13% was good.

After finishing the work on the runic matrix, I went to sleep and prepared for tomorrow's ritual.

***

The next day after I woke up, I was notified by the butler that all of my Generals had arrived and were waiting for the next orders.

"So, the operation could start?"

I asked Architect as I was going to the room where surgery would be done. Architect himself will perform it through a specialized Arcane Mechanical Automaton that was built for this occasion. I didn't trust anybody else with my body.

I lay on a white table while waiting for the Automatons to start.

[Soon, you will fall asleep, and when you wake up, everything will be already done.]

Said Architect to me as I started losing consciousness and falling asleep very quickly. At least that machine was considerate enough to do the surgery when I was unconscious, so I won't feel that hellish pain two times.

After I woke up, I didn't feel very different from before, but If I focused, I could feel a second heart beating in my chest and functioning as the original one.

"So the surgery has been a success, I see."

I muttered.

[Yes, indeed. Compatibility is good, so the heart was successfully accepted by your body. Now we can start the last part of the procedure, but unfortunately, for this one, I can't give you anything to lessen the pain from the ritual.]

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Said Architect in my head.

"Damm, machine. Let's start."

I said, as the runic matrix suddenly lit up, as five figures started supplying the Demonic Energy to the runic formation together with me. All Ultimate-Class Generals were pouring all of their Demonic Energy into the formation, as I felt it reconstructing my bloodline genes.

It hurt like hell; I had to do my best not to scream out of the pain as my bloodline genes were being moved from my original heart, now the first heart, to the second heart. Slowly, during one hour, as I endured this torture, all bloodline genes were moved successfully.

Afterward, everything was done; I could barely catch my breath.

"Return... to... your... position."

I ordered as all five of them bowed slightly and disappeared to their positions.

Interestingly, I even felt my Demonic Energy reserves increased by around 10 Units with the addition of the second heart.

When everything was done, I felt I could subconsciously use The Devour ability, just like I used Dark Light. It felt so natural to me.

[Master, you should check the mirror.]

Said the Architect's voice as I summoned a small mirror and looked at my appearance.

My previously pure crimson-colored hair now had countless silver streaks among it. Probably due to the bloodlines in my body achieving equilibrium, I now looked more like Lucifer in terms of appearance.

My previously light blue eyes now were royal purple. I heard that people with purple eyes were destined to be Rulers, Emperors, and Sovereigns. It was a sign that one was blessed with a noble fate, though I am inquisitive if it is true.

Still, that was something that I would research in the future; now I had my Clan Trait unlocked, I could devour the energy from the corpse of that Fallen Angel General, and then only visiting the Familiar Forest remains, and the Planar Conquest could start.

"This success was mostly attributed to the Book of Lucifer... I wonder how it got into Zekram's hands. It is something that Lucifer and Lilith would guard at all costs; both of them are Super-Devil Class, and I doubt Zekram would steal it... meaning."

I said to myself as I suddenly realized something.

[Meaning, it was given to you on purpose... probably by Lucifer or Lilith, maybe by both.]

Finished Architect for me. If that was the true cause of things, the true scenario Lucifer already knew about my heritage, I was awaiting something similar, that Zekram probably won't hide my heritage from Lucifer.

It was only a matter of time before he would call for me and assign me a Lucifuge. There was a reason why each Lucifer must have a Lucifuge. I felt it from the moment I transmigrated, like an emptiness that cannot be filled with anything.

Whatever I tried, I have never been able to fill the empty cold void feeling I have always felt.

And then... that was the reason.