[item=198821] is a secret mount obtaining from completing the quest: A Whispering Breeze
Video Guide: https://youtu.be/wuRPiFANscA
First you'll need to gain access to the npc [npc=190022].
To do this, complete the questline starting with Sneaking Out /way #2023 56.2 75.8 Initiate Radiya.
Questline can be done while leveling.
To unlock A Whispering Breeze you'll need to pick up 3x [item=201929] that drop from the last boss in Nokhud Offensive [npc=186151].
It seems to drop at ANY renown level with [faction=2503] on live, however a higher renown lvl might increase the dropchances. Can be looted on any difficulty as well.
Also you'll need renown 25 with the [faction=2503] & completed the questline for [item=192799]
Once you've done that, and have the 3x [item=201929], you want to head to [npc=190022], and you'll be able to pick up A Whispering Breeze.
The quest requires you to bring a couple of items:
3x [item=201929], that you've already obtained.
a Tier 3 [item=191506]. This can be crafted by an Alchemist with 22 renown with the [faction=2503], as they need to get [item=191588]. You'll need 50 Alchemy to learn the recipé, however to get a guaranteed tier 3 [item=191506] you'll need about a 250 skill in incenses as well. The [item=191506] is thankfully BoE, so you can get this from other players, from the auction house etc.
[item=201323] is the last item needed. This is unlocked at renown 7 with [faction=2503], and can be purchased from [npc=196707] for 1xOccasional Sand & 50x[currency=2003].
Occasional Sand drops from Time-Lost mobs in Thaldrazsus at about 5-10% dropchance. /way 60.0 82.0
Be careful not to click the [item=201323] as it will disappear from your bags and you'll have to get a new.
Once you've aquired all the items, head to Ohn'ahra /way 57.59 31.92. to turn in the quest and recieve your new bird transform mount [item=198821].
Credit to Syiler, Epic/Ursoc, MissMarvel & the rest of the Secret finding discord community for figuring this out.