To give some self-analysis on this feat.

• Bonus dexterity is consistent with similar racial feats (Squat Nimbleness etc.)
• Being able to use Acrobatics as a save against being knocked out of the air will be a minor boost in most cases where your dexterity save should be quite good anyway. Where it is most powerful is when a save is based on another ability such as Strength or Wisdom, but is intended to represent the player flying in a constant evasive pattern, making it hard to reliably bind or paralyse them in any way. I was going to include some other debilitating effects such as Stunned or Incapacitated, but these tend to be delivered by something that has already hit you, in which case your movement already hasn't helped, plus neither of these actually cause you to fall I believe (though being unable to move is a bit unclear). I have wondered about whether to just make it anything that will knock you out of the air, but decided that that was probably too broad.
• Advantage to acrobatics/performance is limited to your own turn so it won't normally stack with part 2 unless flying between jagged rocks or such. It mostly gives ease of complex flying movement, or gives you a non-combat benefit to impress people with your flying.

Being able to use an Acrobatics check instead of a con save is pretty strong... especially when combined with Expertise. Maybe just switch it to Dex sav to keep the flavor but without breaking it.

Quote from OgGruul >>

Being able to use an Acrobatics check instead of a con save is pretty strong... especially when combined with Expertise. Maybe just switch it to Dex sav to keep the flavor but without breaking it.

That's actually how I was originally going to do it, but the problem is a lot of cases will involve Dexterity saves anyway, so you'd be gaining no benefit if your character already has Dexterity save proficiency. This also only applies to a very limited set of cases, i.e- it's no use against an effect that just deals lots of damage.

While Expertise does have the potential to make an acrobatics check quite strong, and there are a few other ways to boost checks compared to saves, you're having to invest something into doing so so I didn't think it was too OP with that in mind, i.e- you'd need to pick Acrobatics as one of your expertise choices as a Rogue or Bard normally, or take the Skill Expert feat (on top of this one), and this offers no protection from simply taking damage until you go unconscious so being airborne in many ways still leaves you exposed.

There's also the little known rule that the higher a skill bonus gets, the worse you roll. 😉

I've play-tested this for a while and I think it's reasonably balanced; there are other ways for a DM to push-back against a player who is abusing flight.

Boosting ability checks is really easy compared to boosting compared to Saves.
Flying is really good already and making the only weakness easy to handle can be a problem.
Other thing that is hard for me to imagine is a Aarakocra dodging a strenght saving throw with Dexterity. Even Constitution saves.
It's not broken, but as i said, counter the only weakness an archer aarakocra haves.

Edit: A better idea for me is you to apply your proficiency bonus to the check instead of changing it to Acrobatics (if it does not apply it already).

So a Aarakocra with 10 STR would have a +3 on the save instead of a +0 against earthbind at level 5 for example. Not a +7 (dex 16, expertise).

This is really good and I wanted to make something like this or zanier from the legend of Korea so my character could fly.

hey thats a cool feat

That is cool! Keep it up😁

Changing a saving throw to a DEX based ability check, Flat out broken.

Example: Aaakocra: Rouge, lvl 11

> This character would have reliable talent and CANNOT roll anything less than a 10 on ability checks.

> Would likely have expertise in Acrobatics doubling the proficiency bonus, at level 11 that would be +8

> Minimum 18 in DEX at that point, most likely a 20 but lets just say 18 to be fair, granting another +4

Conclusion: A player could have an 8 in Wis, granting them a -1 to saving throws. With this feat, on the above build, that -1 saving throw now changes to a +12 ability check. With reliable talent the player CANNOT get anything lower than 22 on an Acrobatics (DEX) check. I do not think there is a monster/creature in the game that has a 23 spell DC.

Quote from Big_Nav >>

Changing a saving throw to a DEX based ability check, Flat out broken.

As I've already pointed out; this part of the feat only applies while flying and only against specific effects so it's hardly broken, it just makes you (potentially, if you build specifically for it) highly resistant to being knocked out of the air. It does nothing against other effects such as damage, being stunned etc.