Excerpt on Metamorphosis, and Other Forms of Demonic Reproduction
From: A Study on Demon Behaviour, by Lyra Lunareth
It would be an error of both scholarship and wisdom to assume that demonkind reproduces in any singular manner. Unlike mortals bound by fixed biological laws, demonic propagation is a fluid and multifaceted phenomenon, manifesting differently across species, temperaments, and magical affinity. Historically, demons pursued reproduction as a tool of war. In modern times, their motivations would better be described as compulsory, a lingering instinct embedded deep in their essence that many of their kind do not understand.
The most fascinating, albeit ethically troubling, form of demonic reproduction I have observed (though never personally witnessed, I should clarify) is Metamorphosis--a transformative process by which a demon infuses a significant quantity of its essence into a human host, thereby rewriting their very soul and reshaping them into a new demonic entity. This procedure is rarely done lightly, as it requires special circumstances to be performed without incidence. Consent from the human--such as a wish to become corrupted--is one such circumstance, as this would allow the demon to corrupt their essence instead of using their own. Once transformed, the new demon can never return to normal, and their spirit's will be sent to the Underworld, should they ever perish. Some may retain fragmented memories of their past life, but these are often distant, unimportant--mere echoes of a lost humanity.
There is no universally agreed-upon terminology for the relationship between the "parent" demon and the newly born. Some refer to them as daughters or sisters, while others view the result as a mere extension of their will, denying any responsibility for the creature they have created. Others prefer the term servant or thrall, if they intend to subjugate their progeny.
Side Note:
While I use gendered terms when referring to demons--almost always female--I would like to clarify for the sake of precision that metamorphosis can occur through male hosts as well. However, only male demons seem capable of transforming mortal men, and male demons have become increasingly rare, even more so than elves. It is possible they have even gone extinct on the surface, but for the sake of clerical consistency, I shall refrain from using gendered language moving forward, at least where it makes sense.
Metamorphosis comes at a significant cost. The sheer volume of essence required to birth a new demon is staggering. Most demons cannot afford to part with so much of their strength, and fewer still would risk weakening themselves to create a potential rival. That said, some do precisely that--often with the previously stated intention of subjugating the new demon as a servant, bound to them by shared essence. Others may do so for sentimental reasons: curiosity, loneliness, even desire. I do not pretend to understand these impulses myself, although my assumption would be that it is an unconscious command instilled by the Goddess of Demons. At the very least, it occurs often enough to merit further academic interest.
A related but less demanding process is spiritual possession. In this case, a demon spirit enters a mortal body, gradually overtaking it until the soul is either expelled or subsumed. This requires far less essence than metamorphosis, but presents its own dangers. The possessing demon could be of equal or greater strength, and once fully embodied, may no longer be controllable. Demon cults occasionally employ this technique to "resurrect" deceased masters, a term I use loosely. Let it not be forgotten: demons are spirits first, flesh second. Their bodies may die, but unless their essence is scattered or sealed, they remain intact within the Underworld. It is this persistence of soul that allows them to return--sometimes centuries later--by being drawn back into the world through ritual or willing sacrifice.