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The Reins of the Vitreous Stone Drake drops from Slabhide in the Stonecore on both Normal and Heroic modes. It also has a chance to be listed on the Black Market Auction House.
Here you can buy Vitreous Stone Drake for EU or US Servers.
You'll get guide for getting Vitreous Stone Drake
You'll be able to get Vitreous Stone Drake
Vitreous Stone Drake mount
In Dragonflight service now is possible to do with lvl 1 characters.