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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…
He continued to grow stronger, to maintain the castle and serve his masters… He didn't envied this creature, he looked forward for his young master to be born, so he could one day see how he slowly develops and grows. Belphegor waited for him patiently.