The First Denied Soul
The First Denied Soul is the hugely powerful Undead force that effectively controls and drives the souls of the restless dead through the veil between Unlife and Accitaine. It is an angry and frightful entity that has long lost whatever humanity it once had, and the centuries of being stranded in an otherworldly limbo stopped from going on towards its rest has driven it mad it beyond all reasoning. It hungers to destroy all life, but will use the living to achieve its ends, though ultimately regards them as tools who must die too. It began as the soul of the First mortal in Accitaine to die after the death of Korvaio, and one who saw briefly the afterlife before the way was closed; seeing Paradise and then being denied it to roam lost and cold beyond the mortal plane dealt a great blow to the soul, and things have gotten worse over the years, until its cold rage and fury have become all encompassing.
Not all who die serve the First Denied, but many, many do, and their numbers grow over time as its grim influence draws them in, leaving the remaining defiant souls in a sadly isolated and threatened position, often attacked and imprisoned by the First’s cohorts, with the greatest ally of these souls being the Solar Angel Saaravatra who helps fight and protect them, though the good souls are beset on all sides and fighting a losing war. Upon death, Good souls have the best chance of resisting the First, with Neutral Ones having a fair chance as well, though Evil ones have very little chance of resisting the lures of the Undead God unless they are aided by Good souls waiting on the other side to show them the way.
The First has no form and has no avatar; it is too great and alien in its thinking now for that. It is limitlessly evil, malign and it has become like a God of the Undead, so much so that its mortal followers (Oracles of Bones, Sorcerors of Undead bloodlines, Summoners and rare Dark Clerics) gain power from it, seemingly unlimited unlike the embattled followers of dead Korvaio.