Sorathic evil is here defined as a purely negative, short-termist and destructive kind of evil; ultimately motivated by resentment and hatred of God and all that is God's creation.
I envisage Sorathic evil as a kind of end-stage (end-times) phenomenon; and one we may observe following-on from the recent and current Ahrimanic evil that denies the reality of God, creation and the spiritual realm altogether; and attempts to impose a wholly materialistic and scientistic, Global Total System of surveillance and control.
This Ahrimanic evil takes a long-term perspective, aiming to maximize quantitative human damnation - and in pursuit of this goal includes necessarily various elements that are good; such as the bureaucratic virtues of obedience, thoroughness and hard-work.
Ahrimanic evil aims to create a system of value-inversions (virtue becomes vice, while sin is encouraged and rewarded; truth becomes hate-facts and fake-news, while lies are science... etc.). This System will (by such means as law, media propaganda and corporate regulations) subversively 'process' people into a social structure that is anti-God, anti-Christian, anti-Good.
But as Ahrimanic evil has become dominant and pervasive, and gets closer to completion (as is happening rapidly at present) so the stage is set for Sorathic evil.
It will begin to be 'noticed' that The System still relies upon good-motivations (e.g. residual habits of thinking and behaving inherited from tradition and Christianity; or innate common sense evaluations and survival instincts as a consequence of human biology).
When these tacit and implicit Christian (or Pagan) virtues are pointed-out; and the Ahrimanic will begin to lose faith in their compromises.
As The System becomes more 'total', and as Good agents are disempowered and suppressed) inevitably Sorathic zeal begins to focus on those aspects of the The System itself, that conflict with the aims of evil.
Extremist and impatient Sorathic agents will turn-upon the plodding 'moderates' of evil; aiming to purge them. Indeed, by this point the sincere Ahrimanic agents will be among the least-evil of those who wield power and influence.
Until that point, short-termist immediate evil cannot prevail; because it cannot self-organize. After all, Sorathic agents will fight each other whenever immediate advantage is to be gained from it.
However, when Good has been substantially destroyed and replaced with an evil-orientated and evil-permeated System; then there will commence a kind of natural selection among agents of evil.
Sorathic agents that are more short-termist (hence destructive) will begin to prevail over Ahrimanic agents who are trying to be long-termist by clinging-onto virtues like obedience and pragmatic long-termism.
And Sorathic 'gratification' is, at this extreme, sheerly spiteful destructiveness. A Sorathically-motivated being will destroy even when this takes hard work, and even when it harms the Sorathic being.
(For a Sorathic being; cutting off your nose to spite your face is normal operational procedure.)
Against such reckless, frenzied, destructive hate; the sensible, practical, self-seeking Ahrimanic 'moderates' will be helpless.
For this reason I do not think that there can be a specific being of Sorath.
Instead Sorathic evil is a kind of mass effect, the product of many spiteful individuals operating in a situation of advanced-evil where good agents have been dispersed and stripped of power. Individualistic spite will prevail.
There cannot be a Sorathic 'leader'. Any attempt to plan and lead Sorathic activity, would be self-contradictory! After all; planning and strategizing of evil is Ahrimanic rather than Sorathic!
Maximizing immediate short-term destruction is intrinsically opposed to optimizing long-term Systemic evil They are goals that cannot simultaneously be pursued - one or the other must prevail.
In conclusion, I do not think that Sorath is a specific being, but a type of evil: the most advanced and extreme type of evil - therefore, one that cannot thrive until the ground has been prepared for it, by the success of Ahrimanic evil and its expulsion of Good agents from public discourse and practice.
And the ground has, very nearly, been exactly thus prepared; and the ascendency of the Sorathic has already begun.