20 transmog appearances in Trial of the Champion.
Belt of Merciless CrueltyMail Waist
Black Knight's RondelOne-Hand
Boots of the Crackling FlameCloth Feet
Drape of the UndefeatedCloth Back
Embrace of MadnessCloth Chest
Gauntlets of RevelationPlate Hands
Girdle of Arrogant DownfallPlate Waist
Girdle of the Dauntless ConquerorMail Waist
Girdle of the Pallid KnightPlate Waist
Gloves of the Dark ExileMail Hands
Handwraps of Surrendered HopeCloth Hands
Helm of the Violent FrayPlate Head
Leggings of the Bloodless KnightMail Legs
Mantle of Inconsolable FearCloth Shoulder
Mask of Distant MemoryLeather Head
Shoulderpads of the Infamous KnaveLeather Shoulder
Spectral KrisOne-Hand
True-Aim Long RifleRanged
Vambraces of Unholy CommandPlate WristSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot The Black Knight this reset.