The main problem with AV is there isn't even a theory of how to beat him. If you have a tactic thats effective, you can work on it, and experiment with different ideas. Unfortunately, nothing thats been done has really had an effect on him.
The SE Video gave a few new ideas to start with, but nothing that was tried really got us any closer. Theories tried:
1. Spamming 2 hours after AV 2 houred could lock its 2 hour.
Spamming 2hours was tried, but had no noticable effect. AV continued to 2 hour, and could still reuse the same 2 hour.
I am not sure why that was ever conceived but the video points out itself that doesn't work.
2. Matching 2 Hours after AV 2 hours.
Matching 2 hours was tried and also had no effect. AV continued to use its 2 hours on time, and continued to use 2 hours that had been matched.
Was this done under the condition that this needed to be done as fast as possible? Not "Did he just use Chianspell, should I chainspell?" ordeal. I highly believe that once AV uses you are timed to match him. 2 out of the 3 important 2hrs show this in succession and without delay.
3. Rotating low strength nukes of the element of the current day either weakens AV, or negates its regen.
In the video the BLMs spammed low strength nukes of the day. When players tried this, there was no noticible weakening of AV, and no interruption in its use of 2 hours. It possible has an affect on its regen, but it doesn't prevent it.
Only one Thunder was cast during that and it was promptly on the start of a new day. The rest appeared to be high spells... hell even a Blizard 4 was used (Although i would hope it was stopped before going off).
4. Aggressive Actions on AV encourage it to use Aggressive 2 hours.
Theorised after some people were mashed by 2 hours after using agressive abilities on AV. Unfortunately, people simply holding AV found that they got mashed as well, having used nothing for hate that the SE team didn't use.
This Aggressive action was only done near the mobs death, not at the start. Up until slowing up the Regen. almost everyone was using a staff, there are exceptions such as the relic scythe.
5. Using Job Abilities including Weaponskills provokes AV into using Agressive 2 hours.
Analysis of the videos showed no correlation between aggressive 2 hours and AV using nasty 2 hours such as Chainspell. People would use abilities and AV didn't respond, and no abilities were used and AV would still use nasty 2 hours.
Most if not all of the Demo videos show the PLD using his Abilities as well as other people ignoring that rule. Idk why this would be conceived either considering Using or not using JAs wasn't a part of the movie clip. They were mainly trying to say alive hence why there are so many earth staves.
6. There is some way of players regenerating 2 hours so that they can be used multiple times against AV (probably to effect points 1 & 2).
No regenerating of 2 hours has ever been observed. The theory came about as some players in the SE video use 2 hours multiple times, and there were no way for them to do this when AV was introduced.
Yes multiple people used 2-hours repeatedly... but not in the same scene.
Timeline is shortened but i believe that the time the day changes to thundersday to the next scene where its and early thundersday are two completely different days... this puts this AV fight at 7 hours easy already.
Then into the final day being Iceday... adding an additional 6 hours atleast.
The timeline in this fight seems more accurate and can explain why they used 2hours seeming somewhat more possible on the same day.
There are reports of all of these being tried after the SE video was released. We tried them all as well, to no effect.
So far, since the SE video was released, there have been no confirmed locking of AVs 2 hours and no confirmed reports of PCs being able to effect any changes to AVs 2 hours (either the frequency AV 2 hours, or which 2 hours it uses). Most theories on how this needs to be killed rely on affecting or locking its 2 hours, and so far, it's preved to be the proverbial immovable object.
Whether you believe the reports or not, noone is killing it, and it hasn't been killed since the SE video. Either the point of the video has been missed by the entire playing population, or the mob is broken. Either way, if the answer is in the SE video, it isn't obvious.
At a minimum of a 13 hours fight I would think these players took their time with the mob and slowly killed it.
Days that would seem confusing like Lightsday and Darksday aren't that hard to figure. Either use one or all low tier Dark or Light related primary nukes and hope it keeps the regen down... otherwise your in for a tough 2 days and a nasty regen aside from killing aerns