Read from the World of Warcraft client build files.
How Legplates of Willful Doom Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Legplates of Willful Doom suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Legplates of Willful Doom is part of the transmog set Battleplate of Cyclopean Dread (Death Knight only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Legplates of Willful Doom Fits
Other Items Named Legplates of Willful Doom
6 other items in the current build are also called Legplates of Willful Doom. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 105316 (105311 to 105321) were usually added in the same batch as Legplates of Willful Doom: the same quest line, zone, vendor or reward set.