Souls

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"The birth of one of Kain’s abominations traps the essence of life. It is this soul that animates the corpse you ‘lived’ in. And that Raziel, is the demise of Nosgoth. There is no balance. The souls of the dead remain trapped. I can not spin them in the wheel of fate. They can not complete their destinies."

- Elder God

Souls were the eternal, non corporeal spirits of most, if not all lifeforms in the land of Nosgoth. Souls were featured throughout the Legacy of Kain series with varying presentations and were most notably seen in the Soul Reaver arc, as Wraith Raziel had to consume souls regularly to survive.

Souls resided in the body of their host until death, when they departed for the Spectral Realm. Several species of spectral-native fauna were known to prey on the lost souls in the underworld and some of these souls were apparently fed to the Elder God to maintain the flow of his Wheel of Fate.

Role
The Legacy of Kain series often featured the souls of characters and enemies beyond their natural death, although both the design and relative sentience of the souls have varied.

Blood Omen: Legacy of Kain
Souls were first featured in Blood Omen: Legacy of Kain, where the ability of Souls to live beyond the physical death of the body was part of the background to the story and an often seen part of gameplay, with souls presented as a semi-transparent figures. Three of the major characters of the story were beyond death and in the initial chapters of Blood Omen, Malek's soul was imprisoned in within his armor for his failure to prevent the slaughter of the circle, Ariel's soul trapped at the Pillars of Nosgoth by their corruption, and Kain assassinated and his soul offered a chance of vengeance and resurrection (as a vampire) by Mortanius. Throughout his journey, Kain's quest would be guided by Ariel and he would encounter Malek on several occasions as well as encountering soul-manipulator Elzevir the Dollmaker, who had imprisoned the soul of the Princess of Willendorf in a doll. Many enemy characters were also observed after their deaths, as ghosts and several items and spells were related to souls and soul manipulation. (see Soul-Related items)

Legacy of Kain: Soul Reaver
Souls were central to the mythology and back-story to Legacy of Kain: Soul Reaver with Kain having "snared" the souls of his lieutenants to to revive them as vampires at the outset of the Soul Reaver era, and this method had been continued giving rise to the vampire clans of Kain's empire - but through this relationship they had also inherited the the corruption present in Kain's soul, leading to the eventual devolution of the Vampire clans of Nosgoth in bestial forms. After his execution, Raziel was spared "total dissolution" by the Elder God and the Elder immediately voiced his objections to Kain's Empire, blaming the imprisonment of Souls caused by "Kain's abominations" for the "demise of Nosgoth" as well as stalling the Wheel of Fate and preventing souls from completing their destinies. Accepting the Elder's offer of vengeance against Kain, Raziel was revived as a wraith, native to the Spectral Realm and needing to regularly consume souls to refill his Health coil and maintain his Material manifestation (indirectly feeding the Elder and his Wheel of Fate through this process). He was also able to refill his health at a special Soul well in the Underworld and at special platforms notably seen at the Underworld, Pillars of Nosgoth and the Chronoplast.

Raziel would encounter many souls throughout his journey, depicted as floating green globes. Upon the death of a Human or Vampire enemy, their soul would be liberated and could briefly be consumed in the Material Realm before it they faded into the Spectral Realm, where many "lost souls" lingered after death. Raziel could also feed on Souls of humans non-fatally by 'sipping' at their soul energy. Most significantly however, Raziel could feed upon the souls of his brothers after defeating them and he would then gain their abilities, enabling him to further explore Nosgoth. Along with this the legendary Soul Reaver blade returned, wielded by Kain against Raziel in their confrontation at the Pillars and ultimately broken, shattered against Raziel, providing him with the Wraith Blade, his own symbiotic version of the Soul Reaver blade. After, Raziel was able to meet with the long trapped ghost of Ariel, who would help guide Raziel.

Soul Reaver 2
Souls were again featured in Soul Reaver 2 with Raziel's need to consume souls and several related aspects returning. As before, souls could be found in abundance in the Spectral Realm, where they were preyed on by Sluagh variants, or could be gained by defeating enemies in the Material Realm. Souls in Soul Reaver 2 now came in distinct variations, with plain yellow globes for human and animal souls, and blue skulls for demon, thrall and mutant souls; with Spectral enemies maintaining a semi-transparent form when defeated. The souls of the Sarafan warrior inquisitors (who would go on to become Kain's lieutenants) were different to other souls, appearing similar to other human souls but were colored blue and they quickly rose away, preventing them from being consumed by Raziel. Raziel would also encounter two 'ghosts' in the Post-Blood Omen era - first the apparent spirit of Moebius (subsequently confirmed to be an illusion) and later whilst at the Pillars, Raziel would once again encounter the spirit of Ariel.

The Soul Reaver blade also took on a new significance in the story, with the Wraith Blade beginning to compete with Raziel for consumption of souls (turning its hunger on him if over-aroused) and the revelation of its ability to create potentially history derailing Paradoxes when meeting another version of the blade. Raziel would use the wraith blade to trigger several history-altering paradoxes, with it ultimately revealed that the deranged soul devouring entity within the blade was Raziel himself.

Legacy of Kain: Defiance
Souls returned in Legacy of Kain: Defiance once again they were heavily involved with Raziel's ability to consume the souls of his enemies, with him now able to physically 'rip' the soul from a downed enemy. As in previous titles, Raziel could recover souls from the Spectral Realm among several spectral fauna or gain them by defeating enemies in the Material Realm though he was also able to fill his health from special Soul basins. Souls in Defiance were more 'humanoid' than previous appearances in the Soul Reaver arc, featuring full bodies (and occasionally faces) appropriate to their species, with Raziel able to observe both human and Hylden souls (when encountering Possessed Revenant enemies). Raziel could once again encounter fully sentient ghosts of Ariel and the original Ancient vampire guardians and he could use their souls to power special Soul conduits to upgrade the Wraith Blade, itself once again a significant part of gameplay and the back-story.

Death and the Wheel of Fate
Souls apparently had their origin in the Elder God's Wheel of Fate - the "purifying" cycle of life, death and rebirth to which all souls were bound. The soul of a Human, Vampire or other creature inhabited their body until death, when the soul departed for the Spectral Realm (though some could be observed in the Material Realm for a brief period, with certain souls able to manifest in the Material Realm as ghosts at will. In the spectral Realm 'lost souls' could be fed upon by agents of the Elder God, such as Raziel and the Archons, indirectly feeding the Elder and would then presumably be re-spun in the Wheel of Fate and be re-born ignorant of their former lives. Whilst in the Spectral Realm however, the souls were vulnerable to soul scavengers such as Sluagh and Vampire wraiths.

As the vampire races were immortal their souls were "imprisoned in the flesh" and could not be re-spun in the wheel, which would eventually cause the wheel to stagnate in the late Soul Reaver era thus the Elder considered them an "abomination" and actively sought to eliminate them, covertly manipulating "All the conflict and strife throughout history" to ensure the flow of souls to the wheel of fate.

Soul-Related Items and Abilities
Throughout the series several items and abilities have involved the use or manipulation of souls, perhaps most significant among these was the Soul Reaver blade noted for consuming the Souls of its victims and the several soul-displacing Possession abilities.
 * In Blood Omen, souls were mentioned in dialogue relating to several items and spells. The Wraith smiths responsible for the Spirit forges were acknowledged to "forge their items with forfeit souls" and Elzevir was noted to manipulate Souls, imprisoning the soul of the Princess of Willendorf in a doll. Kain could also extract Souls himself using the Spells Control Mind, Spirit Death and Spirit Wrack, all of which forcibly displaced an enemies soul ( two of which could allow Kain to control the vacant corpse). Alongside this, the Soul Reaver blade was noted to "feed on the souls of any creature it strikes" and the Wraith Armor as "tempered from the seething agony of tortured souls".
 * In Soul Reaver, Raziel would gain many of his abilities (Phasing through gates, Scaling walls, Swimming and Constricting) by consuming the souls of his brothers. Raziel would also gain a version of the Soul Reaver blade when he gained the Wraith Blade (and the additional Fire Reaver), though the blade was extremely powerful it was fragile, dispersing after a single hit, and the souls of dead enemies remained for Raziel to feed on.
 * In Soul Reaver 2, the Wraith blade returned in a prominent role. Initially it was as fragile as its previous appearance but after meeting its former self in the the Soul Reaver it was reinvigorated and could be summoned at will, but would consume the souls of its victims if over-aroused, eventually turning its hunger on Raziel. Through the story Raziel could imbue the Wraith Blade at special forges with several elemental enhancements (Dark, Light, Air and Fire).
 * Souls did not explicitly appear in Blood Omen 2, though they were mentioned in dialogue. The Soul Reaver returned and was an extremely powerful weapon but was stolen for much of the story by the Sarafan Lord. Similar to the method Raziel used to gain abilities in Soul Reaver, Kain could gain Dark gifts from an enemy vampire by Absorbing their veins, which seemed to resemble consuming their soul.
 * In Defiance, Raziel was deprived of Planar portals and began to use Possession of corpses to reach the Material Realm, encountering similar Hylden enemies using the same method. The Wraith blade also returned as Raziel's only weapon, this time Raziel could actively feed the souls of enemies to the Reaver enabling more powerful Charged attacks and Reaver spells. Through the story Raziel could enter sealed forges in the Vampire Citadel and gain several elemental enhancements for the Wraith blade (Dark, Light, Fire, Air, Water, Earth and Spirit) many of which were gained by the Wraith Blade consuming the souls of the former ghost Pillar Guardians. When Raziel finally met and defeated Turel, as with his other brothers, Raziel was able to consume his soul, gaining Enhanced telekinesis. In addition, Raziel could also gain the Soul Stealer spear in Vorador's Mansion - named for his own Soul-devouring wraith incarnation.

Soul-Related Enemies
Many enemies encountered in the series were related to souls in some manner, particularly related were those inhabiting the Spectral Realm.
 * In Blood Omen, after Kain had killed enemy combatants he could re-visit a room and it would be populated with ghost versions of the living inhabitants, which could be fed upon when defeated, providing Blue Blood which filled Kain's Magic energy. The exact relationship between Soul and ghost is particularly unclear and it is unknown how some are able to retain their appearance and sentience. In Malek's Bastion, Kain was also able to encounter Malek's warriors, wraith enemies whose souls had been fused to their armor much like Malek himself.
 * In Soul Reaver the inhabitants of the Spectral Realm (including Raziel himself) fed on the lost souls therein. In this realm, the souls were vulnerable to consumption by Raziel and other soul devouring Spectral creatures such as Sluagh (natural scavengers of the Spectral Realm) and Vampire wraiths (vampire souls that had adapted to the Spectral Realm and were able to drain soul energy at a distance) though the soul energy of these enemies, seen as semi-transparent figures, could be fed on in the same manner as ordinary souls. If allowed to re-inhabit their corpses and the instrument of their death removed, Vampire Wraiths would return to the Material Realm as Revived vampires, bringing their soul-draining prowess with them. Both Sluagh and Vampire Wraiths would become semi-transparent when defeated, however they could consume souls to recover damage at any time.
 * Soul Reaver 2 had two variants of Sluagh scavenging souls in the Spectral Realm. The Lesser Sluagh were bipedal and humanoid, whilst their Greater Sluagh cousins were powerful quadrupedal beasts. As in Soul Reaver both would become transparent upon being defeated, but could devour souls to recover themselves at any time. Shades, creatures created from the fragments of coalesced souls, also debuted in Soul Reaver 2 although their soul energy could not be fed upon.
 * Defiance-Enemy-Archon-ConceptE.jpgDefiance featured another variant of Sluagh scavenging in the Spectral Realm, more deformed than previous Sluagh. As before, Sluagh would become transparent upon 'death' but could be restored at any time by consuming souls or even other defeated sluagh. Defiance made clear that the Elder God viewed the Sluagh as "vermin" and introduced his soul-devouring agents, the Reaper and Dreadnaught Archons, who like Raziel consumed the lost souls of the Spectral Realm feeding them to the Elder and the Wheel of Fate. Defiance also featured Lesser and Greater shade variants both formed from the coalesced remains of malicious souls; and several Revenant variants (the Possessed, Transformed, Human revenants, Vampire revenants and Hylden revenants) - created by Hylden souls possessing various bodies.