Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Onslaught Chestguard Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Onslaught Chestguard suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Onslaught Chestguard is part of the transmog set Onslaught Armor (Warrior only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Onslaught Chestguard Fits
Other Items Named Onslaught Chestguard
1 other item in the current build is also called Onslaught Chestguard. 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 150551 (150544 to 150556) were usually added in the same batch as Onslaught Chestguard: the same quest line, zone, vendor or reward set.