Deathcharger's Reins drop off Lord Aurius Rivendare in the Stratholme Service Entrance wing. It also has a chance to be listed on the Black Market Auction House
Here you can buy Deathcharger's Reins for EU or US Servers.
You'll get guide for getting Deathcharger's Reins
You'll be able to get Deathcharges Reins
Deathcharger's Reins mount
Additional budget for Character transfer or Character boost to max level. BMAH Services in Shadowlands now requirement to have a max level character on server, so Trial character will not work.
Free time on evening, if you choose selfplay option