which is the most powerful avatar

[Dantomane]

I voted Skeith.But though Skeith is the first wave according to the epitaph of twilight,Corbenik is the last so in theory what could happen could possibly be;Skeith(death) would destroy Corbenik(rebirth) but It would come back over and over and over again,continuing into an infinite cycle of death,destruction,and chaos forever and ever until we are all long dead and eternity ends as we now it.Yet on earths final hour of the apocolyptic battle, God will play a cruel sick joke and kill off the Angel of Death.Therefore Corbenik will revive the earth and every thing with it but that also means that Skeith is lurking somewere in the shadows and so this apocolypse will repeat in another infinite cycle until Skeith finally wins and ends It all.(phew)
(Kinda like Final Fantasy X Spira story,eh)

[Erranty]

I voted Magus, simply because anything that can us a leaf as a weapon deserves some respect.

[Azure crow]

Its just the AIDA growing in size.

Regarding that AIDA...
 I think it eventually grows to the point to where the AIDA seperates from its host body and shows its true form which in this case was actually Cubia.

 The final form of AIDA isn't Cubia. Cubia is a fail safe in the blackbox created to keep the key of twilight from falling into human hands, and thus preventing it's pervertion. The closest thing we've seen to an AIDA being is Haseo's B-st form, and we can't even confirm that yet.

As far as strongest goes, all the avatars are equal without a user. This is true because they can't manifest, and thusly can't have any powrr whatsoever.
When an epitaph connects to a user, the heart of the user and the level of the character affects the avatar. Any avatar can go berserk, as well.
When things started, Corbenik was the strongest. Ovan's goals tied with Ovan's level set it higher than the level 20-some Skeith(in the canon story).
By the end, though, Skeith was partially fused with the key of Twilight, as well as Haseo's heart and level. Haseo and Skeith's bond is also greater than any of the others, so it's greater.
So I restate:
initially, Corbenik is the strongest. In the end, though, Skeith was the strongest.

[Haseo{Terror of Death}]

I don't know, maybe it's magus

[xthform22]

By the end,Skeith is.
At the start is would be Corbenik.

Second the motion

i second the....hey wait i hate you u beat me i third the motion ha!