In Wrath of the Lich King it is item level 245, requires level 80 and is named Nightsong Mantle. In MoP Classic it is item level 232 and requires level 80.
Read from the World of Warcraft client build files.
How Conqueror's Nightsong Mantle Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Conqueror's Nightsong Mantle suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Similar Items
The 10 items nearest to Conqueror's Nightsong Mantle (item level 35) in item level among Armor > Leather, Shoulder slot, from item level 35 to 39.
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Conqueror's Nightsong Mantle Fits
Other Items Named Conqueror's Nightsong Mantle
1 other item in the current build is also called Conqueror's Nightsong Mantle. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Conqueror's Nightsong Mantle
Blizzard numbers items as they are created, so the named items next to ID 46196 (46191 to 46201) were usually added in the same batch as Conqueror's Nightsong Mantle: the same quest line, zone, vendor or reward set.