Reaver-convergence

"The Reaver is the key. Two incarnations of the blade meet in time and space – a paradox is created, a temporal distortion powerful enough to derail history."

- Kain

The Reaver-convergence is a temporal event caused by two versions of the Soul Reaver blade meeting in space and time. Such a meeting presents a temporal paradox which make the Time-stream vulnerable to change. At least five convergences have been seen in the Legacy of Kain series, with three resulting in history-altering paradox events. The first Reaver convergence was seen in Blood Omen: Legacy of Kain and they were central to the plot of Soul Reaver 2.

Role
Nosgoth's time continuum was extremely rigid and resilient, and did not normally allow for the introduction of paradoxes: the map of each individual's destiny was fully outlined and immutable, accommodating for time travel events and preventing contradictions. Even to characters who knew the future and were aware that "free will is an illusion", resisting history was usually an impossibility: they did not possess the intrinsic free will necessary to defy "the rules of fate and predetermined events". This theory of predestination was a fundamental, indiscriminate constant, and applied to almost all entities within the Material, Spectral and Demon Realms alike.

There were however loopholes to this process - and these were related to the wraith Raziel, who could make choices freely, unhindered by the predestination others were subject to. Only vague descriptions as to why he was singular in this regard were afforded: his free will was usually attributed to "his remaking into the world" at the hands of the Elder God, and his resultant liberation from the Wheel of Fate. It may also have been connected to his destiny to become the captive, soul-devouring entity within the Soul Reaver, and to later wield a future incarnation of his own soul - the Wraith Blade; the meeting and constant presence of two incarnations of the same soul-devouring entity, crucial to the timeline, in close proximity - and the very possibility that one might attempt to devour the other - may have contributed to his unique exemption.

On the rare occasions where two incarnations of Raziel's soul met, in either the forms of the Soul Reaver or the Wraith Blade, a Reaver-convergence was the result: "reality itself" would tangibly warp and bend slightly, creating a sense of vertigo, or displacement. At such points, there was a window of opportunity in which it was possible to create a paradox, potentially sufficient enough to derail history and rewrite the timeline. Kain analogized these junctures to the flipping of a two-sided coin: "suppose you throw a coin enough times... suppose one day, it lands on its edge".

Only relatively slight diversions could be triggered; most major events remained constant in Nosgoth between each timeline. If a paradox blocked the time continuum, history would always follow "the path of least resistance while admitting only the slightest alterations". Defying the force of history was always a dangerous gamble - "if events [could not] be reshuffled to accommodate the change", the irritants responsible for the contradiction would simply be expelled from the time-stream. Such a fatal paradox did not overtly happen in the Legacy of Kain series, but the concept served as a looming danger which Kain and Raziel were forced to acknowledge and remain wary of.

A number of Reaver convergences were seen in the series, with the first occuring in Blood Omen: Legacy of Kain chapter Stranded in Time, when Kain was manipulated into going back in time and eliminating William the Just, though it was not explicitly labelled as such at the time. Time Travel and the inherent paradoxes involved would become a central theme of Soul Reaver 2 which would go on to feature Reaver convergences in A Reaver in Time, A Fateful Meeting and Epilogue as Nosgoth's historcal continuum was explored - and the convergence ultimately explained by Kain with reference to the first convergence. Kain subsequently persuaded Raziel to use such a convergence to spare his life and later used another convergence to temporarily spare Raziel - changing history significantly in the process.

Known and observed convergences

 * The First paradox - The young vampire Kain travels to the Pre-Blood Omen era, seeking to eliminate the future tyrant ' The Nemesis. He battles the boy-king William the Just, with both armed with the Soul Reaver. The resulting paradox creates the Second timeline - wiping the Legions of the Nemesis from history and replacing them with Moebius's mercenary army.
 * The Reaver convergence - Time travelling wraith Raziel finds William's blade broken in the Sanctuary chapel of the Sarafan Stronghold. His Wraith Blade incarnation of the Reaver manifests and leaches his soul to restore the physical Reaver. Raziel unknowingly rejects a potential to change history by eliminating Moebius.
 * The Second paradox - Raziel returns to the Sanctuary chapel to find Kain awaiting him with the physical blade. Kain hands the physical blade to Raziel causing the Wraith blade to manifest. Revealing the nature of the Reaver convergence to Raziel, Kain persuades Raziel to spare his life, changing history and creating the Third timeline.
 * The Third paradox - Raziel travels to Nosgoth's early history and is tricked into using the physical Reaver as a weapon when his wraith blade is disabled. When all enemies are exhausted and the wraith blade returns it turns the physical (vacant) Reaver on Raziel, impaling him and dragging his soul into the blade to create the Soul Reaver for the first time. Kain arrives and uses some precise timing to take advantage of a brief convergence and change history, spawning the large scale changes of the Fourth timeline that allow the Hylden escape from the Demon Realm, the resurrection of Vorador and the conflict between the new Sarafan and a new race of vampires in the post Blood Omen era.
 * The Purification of Kain - As with the third paradox, this is a brief paradox seen at the creation of the Soul Reaver in the fourth timeline in the Spirit forge within the Vampire Citadel of the Blood Omen era. This time Raziel knowingly rejects Kain's aid and sacrifices himself to the blade - in the process purifying Kain of his corruption - with no paradox ensuing.

Background
While both William and Kain had versions of the Soul Reaver in their battle in Stranded in Time in Blood Omen: Legacy of Kain, the full circumstances were not explained by Silicon Knights - although in the official FAQ they did acknowledge the presence of two versions of the blade and the necessity of using the Soul Reaver against William to defeat him.

The paradox created by the meeting of two versions of the Soul Reaver was ultimately developed by Amy Hennig in the course of the development of Soul Reaver 2 both to satisfy the previous alteration of history in Stranded in Time against their concept of history and time travel, but also to account for the further changes to the background that would be introduced in the upcoming Blood Omen 2 by finding a loophole already existing within Blood Omen to justify the historical changes. As Daniel Cabuco explained: "the Paradox was created to help explain some of the inconsistencies of BO2, and to create the ability to change fate. It was entirely Amy's creation: she found a way to use coincidences in BO as a way to explain the ability to change time. I thought it was a brilliant solution!"

- Daniel Cabuco

Retroactively these developments made the meeting between William and Kain in Stranded in Time a juncture point where history was changed and a new timeline was created; while the convergence seen in A Reaver in Time became a point where history was not altered (by the possible death of Moebius at Raziel's hand). The term "Reaver convergence" ultimately comes from the Dark Chronicle chapter title and stage directions of the latter.