This item is acquired in-game. See its sources below.
In the Appearances collection, Malignant Vision's Headguard is listed as Vendor. Appearance ID: 114919. 2 other items wear the same appearance:
Read from the World of Warcraft client build files.
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Malignant Vision's Headguard suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Malignant Vision's Headguard is part of the transmog set Malignant Vision's Battleplate (Warrior, Paladin and Death Knight only). The other 16 pieces:
Malignant Leviathan's Chestplate
Malignant Leviathan's Stompers
Malignant Leviathan's Wargreaves
Malignant Leviathan's ArmguardsMalignant Leviathan's LegguardsMalignant Leviathan's VambracesMalignant Leviathan's WarbootsMalignant Leviathan's WristguardsMalignant Leviathan's LegplatesMalignant Leviathan's CoilsMalignant Leviathan's BootsMalignant Leviathan's SabatonsMalignant Leviathan's GreavesMalignant Leviathan's HauberkBreastplate of Twilight DecimationCarapace of Pulsing VitaBuilt from the World of Warcraft client build files and recorded Auction House snapshots.
Malignant Vision's Headguard is not traded on the Auction House, so it has no live market price. It is acquired in-game from the sources listed above. This page collects its first-party game data (identity, effects and where it comes from) from the official World of Warcraft client build.
TheWoWDB