By - very rough - Aristotelian philosophy the semen, not the womb, is the origin of the new human. That semen is in your case created by Hermetic magic, hence the prime reason for the immortal soul coming into existence is Hermetic, and we get a violation of The Limit of the Soul.
Here is the relevant quote from the Physica:
One way in which cause is spoken of is that out of which a thing comes to be and which persists, e.g. the bronze of the statue, the silver of the bowl, and the genera of which the bronze and the silver are species.
In another way cause is spoken of as the form or the pattern, i.e. what is mentioned in the account ( logos ) belonging to the essence and its genera, e.g. the cause of an octave is a ratio of 2:1, or number more generally, as well as the parts mentioned in the account ( logos ).
Further, the primary source of the change and rest is spoken of as a cause, e.g. the man who deliberated is a cause, the father is the cause of the child, and generally the maker is the cause of what is made and what brings about change is a cause of what is changed.
Further, the end ( telos ) is spoken of as a cause. This is that for the sake of which ( hou heneka ) a thing is done, e.g. health is the cause of walking about. ‘Why is he walking about?’ We say: ‘To be healthy’—and, having said that, we think we have indicated the cause.
( Phys . 194b23–35)
Making the Aristotelian take on conception unimportant in your saga is quite possible! But it goes against teachings relevant to 13th century - nearly all male - scholars, hence may cause in game discussions.