Runeblade of Baron Rivendare

The Runeblade of Baron Rivendare is a two-handed sword with a passive boost to the wielder's movement speed and life regeneration rate.

Background
Baron Rivendare’s Runeblade is a powerful bastard sword. It is Baron Rivendare's most prized possession, next to his undead steed, Deathcharger. The finely-crafted blade bears a false hilt and is etched with necromantic runes all down the blade. The blade pulses with cold power, seeming all too ready to draw blood from enemies. In anyone else's hands, the blade is a simply a bastard sword. In the Baron's hands, however, the weapon becomes a keen frost/unholy bastard sword. The powerful blade also grants anyone who wields the blade fast healing. The sword also allows any wielder to cast Bloodlust on themselves.

Source
The Runeblade drops from Aurius Rivendare in Stratholme at an approximate 0.10% rate. Despite its rarity, Epic status, and associated lore, the actual item's stats are underwhelming. In the early days of WoW, this was one of only a few Epic items that would appear in non-Raid instances.