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Natalia flew down to capture Belphegor after he was hit strongly by Brutus. His entire skull was shattered into pieces and his soul was sliced in half; anyone would think he would die soon. Belphegor himself had gone through a lot of pain, and his own mind began to slowly fade away.
The memories he had of his master and creator, Ainz, the Lich that created Chaos out of his own bones, the corpses of a vampire and a dragon, and the bones of his wife who had turned into a ghost, he remembered his two masters very well.
He remembered the first time he was summoned. His soul was just created in that time, yet he possessed intelligence and experience somehow, and was able to see the world how it was, he was able to experience things around him, and he could see things well. He saw the environment, colors, and people.
A skeleton wearing black robes and with a shiny red jewel inside of one of his eye sockets, and a beautiful ghost lady smiling gently at him. The moment he was summoned he found himself being a giant floating skull… with fire on top.
"Oh, you're a strong one… I shall call you after the Demon of Sloth, Belphegor." Said Ainz, the skeleton, as he gently petted the small skull that Belphegor once was, as he evolved and grew stronger, his skull became bigger with him.
"He's kind of cute? I have never seen a floating blazing skull, they're peculiar and extravagant undead monsters, he'll take good care of things, he seems intelligent as well." Said the ghostly lady, smiling motherly, she also petted and caressed his skull with her phantom hands.
Belphegor in those times, despite having intelligence as an adult and some sort of premade artificial experience at using his powers, was still technically a child that was still growing mentally, he felt the warmth of these two undead as his parents, and seemed happy, flying around them, he was incapable of talking back then, but he slowly learned as he heard them speak.
"Haha! He seems very energetic!" Laughed the skeleton.
"How cute…" Giggled the ghost woman.
His appearance was completely ridiculous, but he accepted it quickly and as a matter of fact, seemed to like to be able to fly. But somehow, it felt as if he was always incomplete. Why was he just a skull? Couldn't he have the rest of his body like his master? These questions pestered his mind for the first weeks of life, but he knew that that's how he was born and that's how things were, and he accepted them.
But sometimes he would ask his master anyways… why was he incomplete unlike him and other skeletons he had seen his master summon?
"Master, why am I the only one that is a skull? Where is the rest of my body?" He wondered innocently.
"Belphegor, you're a Floating Blazing Skull, your Undead race by itself is a single skull. As you've grown stronger, your skull has grown bigger, you specialize in flying rapidly and attacking with your flames. Other skeletons such as me and the skeleton soldiers fight physically- well, not me of course, but I raised myself as a lich from my original body, meanwhile, you were summoned." Said his master.
"I see…" Belphegor seemed slightly enlightened, but in those times, Ainz also noticed some sort of sadness on Belphegor, as he couldn't be like the other skeletons.
"Don't feel sad, Belphegor. You're unique by yourself, that uniqueness makes you someone special, someone that is not like the rest. You're the strongest of my Undead, and your intelligence is superb as well, you're my beloved son too, we appreciate you as you are… We don't feel like you're missing anything." The skeleton said gently. No person would ever think a Lich would say such tender words.
"Father… I can call you father, master?" Asked Belphegor innocently.
"Yes, it is okay. But I would prefer master so the others don't think I am giving you privileges!" Said Ainz, gently smacking the skull of Belphegor.
"I will only use it when we are alone…" Said Belphegor.
"That's good enough… You know? Your mother and I always wanted a son…" Sighed Ainz.
"…"
Belphegor appreciated the love that he was given, the same that every other Undead was given, they were raised with care, despite being a Lich, Ainz was a gentle-hearted researcher, and his entire life he always took care and repaired all his Undead even from the slightest bruise. They fought together and even mourned those that perished in battle… over time, they found an island to call home, a place where they finally settled down.
Belphegor over time began to wonder if his father was alright, he still had the dreams of having a child, Belphegor always knew that although he always said he was his son, it was not enough, after all he was merely a summon.
Ainz wanted a child that at least, could carry a piece of his bones, something that was a desire that lingered ever since he was alive, his wife as well had this desire, it was one of their biggest desires, the desire that kept them going even as Undead.
Every Undead has a desire, a strong desire that makes them, they have resentfulness, they cannot live without it. Unfulfilled desires and wishes often would fuel their desires and what they truly want in life. A dream they could never complete because of how things ended, the two that loved each other, Ainz and Lesithea always desired a child, and worked forward to one day make it.
They wanted a strong child, they stole the corpses of the two strongest clans in the galaxy, and then used their very bones to create it, a chimera with the essence of both of them, with the DNA in their bones. Ainz used the bones he used for his body while his wife took the bones she saved from her corpse, Belphegor saw their son slowly form from a small lump of stitched body pieces, slowly taking a shape from a large fetus all the way into a young adult form…
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