38 transmog appearances and 1 mount, pet or toy drop across 8 bosses.
Rainbow GirdlePlate Waist
Songbird BlouseLeather Chest
Woollies of the Prancing MinstrelMail Legs
Gauntlets of Purged SanityMail Hands
Mask of the UnforgivenLeather Head
RedemptionTwo-Hand
Soul BreakerOne-Hand
Tearfall BracersCloth Wrist
Wailing Nightbane PauldronsPlate Shoulder
Malown's SlamTwo-Hand
The Postmaster's BandCloth Head
The Postmaster's TreadsCloth Feet
The Postmaster's TrousersCloth Legs
The Postmaster's TunicCloth Chest
Fetid StranglersLeather Hands
Grimgore NooseCloth Waist
The Cruel Hand of TimmyOne-Hand
Timmy's GaloshesMail Feet
Vambraces of the SadistPlate Wrist
Barrage GirdleMail Waist
Helm of the New MoonLeather Head
Mantle of the Scarlet CrusadeCloth Shoulder
Master Cannoneer BootsPlate Feet
Willey's Back ScratcherOne-Hand
Willey's Portable HowitzerRanged
Archivist CapeCloth Back
Ash Covered BootsLeather Feet
Foresight GirdleMail Waist
Tome of KnowledgeHeld In Off-hand
Book of the DeadHeld In Off-hand
Crown of TyrannyMail Head
DemonshearTwo-Hand
Fire StridersCloth Feet
Gift of the Elven MagiOne-Hand
Grand Crusader's HelmPlate Head
Hammer of the Grand CrusaderTwo-Hand
Shroud of the NathrezimCloth Shoulder
Wyrmtongue ShouldersLeather ShoulderSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot each boss this reset.