36 transmog appearances and 4 mount, pet or toy drops across 4 bosses.
Arcanite Steam-PistolRanged
Claw of the PhoenixOne-Hand
Fire Crest BreastplateMail Chest
Gloves of the Searing GripLeather Hands
Mindstorm WristbandsCloth Wrist
NetherbaneOne-Hand
Phoenix-Wing CloakCloth Back
Talisman of the Sun KingHeld In Off-handTalon of the PhoenixOne-Hand
Cowl of the Grand EngineerCloth Head
Fel-Steel WarhelmPlate Head
Girdle of ZaetarLeather Waist
Void Reaver GreavesMail Legs
Wristguards of DeterminationPlate Wrist
Boots of the ResilientPlate Feet
Ethereum Life-StaffTwo-Hand
Girdle of the Righteous PathPlate Waist
Greaves of the BloodwarderPlate Legs
HeartrazorOne-Hand
Star-Soul BreechesCloth Legs
Star-Strider BootsMail Feet
Trousers of the AstromancerCloth Legs
Vambraces of EndingLeather Wrist
Wand of the Forgotten StarRanged
Worldstorm GauntletsMail Hands
Crown of the SunCloth Head
Gauntlets of the Sun KingCloth Hands
Leggings of Murderous IntentLeather Legs
Rod of the Sun KingOne-Hand
Royal Cloak of the SunstridersCloth Back
Royal Gauntlets of SilvermoonPlate Hands
Sunhawk LeggingsMail Legs
Sunshower Light CloakCloth Back
Thalassian WildercloakCloth Back
The Nexus KeyTwo-Hand
Twinblade of the PhoenixTwo-HandSign 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.