One of the items available in August on the Trading Post is the Ethereal Transmogrifier. This new toy allows you to summon an emergency Ethereal Warpweaver that allows you to change your transmog wherever you are.
August 2023 Trading Post Line-Up
The main benefit of this new toy is that it allows you to change your transmog even while inside dungeons and raids, which was not always possible with Reins of the Grand Expedition Yak, as you can’t mount up in many dungeons and raids.