In Wrath of the Lich King it is item level 232 and requires level 80. In MoP Classic it is item level 232, requires level 80 and sells to vendors for 1c.
In the Appearances collection, Thassarian's Handguards of Conquest is listed as Boss Drop. Appearance ID: 11791. 10 other items wear the same appearance:
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Thassarian's Handguards of Conquest Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Thassarian's Handguards of Conquest suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Thassarian's Handguards of Conquest is part of the transmog set Thassarian's Battlegear (Death Knight only). The other 16 pieces:
Items Numbered Next to Thassarian's Handguards of Conquest
Blizzard numbers items as they are created, so the named items next to ID 48537 (48527 to 48542) were usually added in the same batch as Thassarian's Handguards of Conquest: the same quest line, zone, vendor or reward set.
Enchanted OnyxID 48527 · Miscellaneous"Teaches you how to summon this companion."