The spell tomes which teach "Soul Sap" and "Soul Siphon" are found inside Ilinalta's Deep, which is inhabited by Malyn Varen and his followers. Their studies revolve around the manipulation of souls, and their master's ultimate goal is to transcend mortality using Azura's Star.
Their experimentation has led to some tangential discoveries: developments upon an existing spell, which are available for the player to discover and learn.
This text will be included as an in-game book in a future update.
The theorem herein illustrates the methodology in which a modified incantation can facilitate the gradual siphoning of harmonic energy from a living medium.
As demonstrated by the traditional "Soul Trap" technique, the initial stabilization of the harmonic field serves to unbind the composite energies from the vessel. The caster shall dismiss signs of protest due to what has invariably been described as a "stinging sensation" among test subjects.
The field is then polarized, resulting in an attractive force towards a receptacle of appropriate dimensions in the caster's posession. This demands constant focus until completion. Utilizing a morpholith of mundane origin is standard practice for this procedure.
It must be noted that drawing from a struggling vessel is by no means a clean affair. The gradual nature of this process imparts a variety of effects which may or may not be desirable.
Primarily, siphoning harmonic energy in this manner will draw additional impurities. Extensive experimentation has shown that these vital essences are attracted to conventional morpholiths, but are unable to permeate them. Rather, these essences are naturally absorbed by the caster, nourishing their physical health.
[insert graphics (the 'theorem' itself) re-used from Malyn Varen's grimoire for visual fluff]
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