23 transmog appearances in Ulduar.
Boots of Fiery ResolutionCloth Feet
Combustion BracersCloth Wrist
Constructor's HandwrapsCloth Hands
Embrace of the LeviathanCloth Waist
FiresoulOne-Hand
Firestrider ChestguardMail Chest
Flamewatch ArmguardsPlate Wrist
Gilded Steel LegplatesPlate Legs
Gloves of the Fiery BehemothMail Hands
Golden Saronite DragonOne-Hand
Handguards of Potent CuresLeather Hands
Iron Riveted War HelmPlate Head
IronsoulTwo-Hand
Kinetic RipperOne-Hand
Leviathan Fueling ManualHeld In Off-hand
Lifespark VisageCloth Head
Mantle of Fiery VengeanceMail Shoulder
Mechanist's BindingsLeather Wrist
Mimiron's Inferno CouplingsPlate Wrist
Plated Leggings of RuinationPlate Legs
Shoulderpads of Dormant EnergiesLeather Shoulder
Steamworker's GogglesMail Head
TitanguardOne-HandSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Flame Leviathan this reset.