First off... When it comes to that statement on "How to defeat AV's Regen" I really, from the deepest depths of my being believe they ment that statement to be about JoL, not AV, and that it was a mistranslation/misunderstanding. Because, for the most part, that is how you reduce/remove JoL's regen.
Marajade said the best statement:
It's a specific reaction to an action within an area, not an additional effect of the weapons themselves, because it changes the workings of a monster within the area, instead of just inflicting damage. (also, even mundane effects like "additional effect paralyze" or "Additional effect, x damage" exist in the dats in a centeral location, just like the new cursed text for the BLM armor.) Its like the message text for BCNMs (Platoon scorpions legs getting stuck in the rocks in KS30)
This is about as clean as you get it.
However.
When you take into consideration:
AV was defeatable via "The wall of justice"
AV was fixed because "TWoJ" was not the intended means to kill it.
AV was killable via
locking the various abilities in sets. This was done by killing the Wynavs in certain ways.
AV was fixed because killing the wynavs was not the intended means to kill AV.
What "hope' we can derive form this is that maybe the trigger to lock AV's abilities was misscoded in the Wynavs during that time.(maybe on purpose as a hint to the dynamics)
A hacker free apporaoch would to look at it in relation to the rest of the game dynamic, which I think Uzor pretty much covered, even with the "It happened, But I got no Proof" aspect of it. We will set that aside for a sec.
Notice a couple things:
AV has little to no evasion. People kiting it on mules report they could easily hit AV while they were goofing off on super low level mules.
Some of the weapons are only able to be used in a 'B' rank or lower on the jobs that can use it.
So when you put all that random "Phraust up at 05:00am babble in one statement:
I think it's highly probable that the use of jailor weapons will result in the killing of AV.
The only thing that someon needs to do:
Non-hacker free approach:
Hack every .dat untill you find that phrase, then figure out the corrolation of that phrase and its linking.