The Soul Trade
There are many different ways to capture souls. The most commonly used methods are spells like
soul bind and
trap the soul, with the former imprisoning the soul of a newly dead creature and the latter trapping the soul of someone still alive. Other creatures, such as the undead called
devourers, have their own innate methods of trapping souls, and likewise
night hags are capable of using a version of
soul bind through their heartstones to capture the souls of those they torment, binding them in dark gems and selling them in planar markets. Still other creatures create magic items called soul jars, which mimic the effects of these spells.
All of these methods, however, pale in the face of
daemons' industrialized harvesting of souls.
Abaddon's fiends use virtually all known methods of collecting and storing souls, many of which are unique to themselves. Cacodaemons, the least caste of
daemons, prove vital to this harvest, and represent the most common means of turning souls into trade goods. These ravenous fiends possess the unique ability to devour the souls of freshly killed creatures; transform their souls into small, jewel-like objects called soul gems; and spit them back up for collection. These gems each contain the basic essence of a soul, and
daemons use them for various raw and refined purposes depending on the fiend in question, the quality and power of the soul, and the daemon's knowledge of soul-warping magic. Of course, many
cacodaemons would prefer to consume the souls in their entirety, rather than passing the spirits on, but more powerful
daemons rarely give them the option, bullying the
cacodaemons into giving up their treasures, employing (or enslaving) a particular individual as a partner in the trade, or maintaining whole hunting packs as pets.
Most methods of using souls extinguish them completely, consigning them to oblivion. In these cases, only the direct intervention of a deity can return them to life—and sometimes not even then, such as when the soul is specifically devoured by one of the Horsemen. Other methods bleed a fraction of a soul's energies away, and while this method is far less powerful, some
daemons capture other creatures for the sole purpose of entrapping them and milking their souls over a prolonged period of time, causing horrific agony for spans of months, years, or centuries before finally giving in to their own hunger and consuming what tattered fragments of soul remain.
Unconscionable as most of the universe considers these practices, trapped souls exist as a commodity replete with their own rampant underground economy, both within the evil-aligned planes and elsewhere. Most of these souls ultimately end up in
Abaddon, though buyers and markets can also be found in
Hell, the Abyss, Axis, and even the worlds of the
Material Plane, as evil spellcasters and item crafters can make great use of powerful souls in their dark rites. The economy is complex, with prices determined not only by the strength and power inherent in a given soul, but also according to each soul's manner of death,
alignment in life, and other criteria. These additional factors rarely influence their use in magical experiments unless a soul was particularly noteworthy, but as the
daemons are happy to explain, the nature of a soul has everything to do with its unique flavor.
While the value of souls is as relative as any other commodity, and pricing can fluctuate wildly based on an endless parade of factors, presented here are some basic categories. With each of these, it's important to note that these are guidelines only, and individual spirits may fall lower (such as a dragon slain young, or a king whose general lack of ambition kept him from great deeds) or higher (a commoner of exceptional piety, or one who never had the chance to fully explore her exceptional abilities) than one might expect. These prices are based upon the supply and demand commonly faced by traders upon the planes where such commodities prove far less outlandish than on the
Material Plane, where prices might increase by 10 times or more (though such has no effect on their value when put to use; see below). As with anything else, the exact value of a soul is ultimately up to GM discretion. It's also worth noting that, while trading spirits may prove lucrative, the practice is undeniably evil and an affront to the natural order, and thus carries great consequences in the afterlife.