Read from the World of Warcraft client build files.
How Demonic Gladiator's Scaled Helm Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Demonic Gladiator's Scaled Helm suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Demonic Gladiator's Scaled Helm is part of the transmog set Fierce Gladiator's Scaled Armor (Paladin only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Demonic Gladiator's Scaled Helm Fits
Other Items Named Demonic Gladiator's Scaled Helm
3 other items in the current build are also called Demonic Gladiator's Scaled Helm. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Demonic Gladiator's Scaled Helm
Blizzard numbers items as they are created, so the named items next to ID 149026 (149021 to 149031) were usually added in the same batch as Demonic Gladiator's Scaled Helm: the same quest line, zone, vendor or reward set.