Deathcharger's Reins



Deathcharger's Reins summon Baron Rivendare's steed, Rivendare's Deathcharger, a mount that adds 100% to movement speed. Prior to Patch 3.0.2 it was extremely rare, even more so than the epic two-handed sword Runeblade of Baron Rivendare. Deathcharger shares the same design as the Forsaken epic racial mount, the skeletal warhorse with a blue color scheme. Its use is not restricted by race or faction.

Deathcharger is the name of Baron Rivendare's skeletal horse. The undead steed is his most prized possession.

Source
Deathcharger's Reins drop off Lord Aurius Rivendare in Stratholme.