I'll try to answer.

1. we don't know

2. we don't know

3. we don't know

There is no white ariel. There is a black ariel, which is a combination of a wind magic ariel and her skill avenger which she call 'nigel'

@Tetsuryuu01 Honestly I can't remember if it was in SO12 or in another book but there is a passage where ariel/Tempest was written as white wind, I think Angelo talked about it at some point so WhitesKitsune might have been refering to this.

PS: Found the image, it was page 542 of SO12 【白き風よ/テンペスト】

@MrSuntastic Ah ok yeah, translation write it as either white wind or tempest

> It's possible to Ais can use White Ariel/wind or was it just a momentary power up?

We do not know at the moment. It seems more likely that it was an equivalent of a limit off for her, spurred by her hearing the Grand Bell. But we can't say for sure either way.

> How strong is White Ariel?

Stronger than Avenger + regular Ariel, which was stronger than SO12 Revis. A Revis that is stronger than the SO11 Revis which Ais had previously compared directly to base Ottar. So, high level 7 tier, if not low 8.

> and Ais will continue using Avenger?

Unsure. If anything, the narrative seems to be that now she is in control of what she perceives as a monster. But, wether that would be relevant later on is debatable. Maybe agaisn't a demi spirit? I don't think it's been mentioned if the skill just dissapeared from her Falna, or if that's even possible. So she should still have access to it.

1º- I imagine that she will be able to use the white wind again, but in a similar situation to the first time she used it, being saved by Bell in a similar way.

2nd- I suppose it will be stronger than her black wind since if she had continued using it Revis would have defeated her, however, with the white wind she surpassed her to the point of defeating her with one blow.

3º- I think that he would use Avenger again, at least at some point in the fight against the black dragon