14 transmog appearances in Naxxramas.
Arc-Scorched HelmetMail Head
Benefactor's GauntletsMail Hands
Blackened Legplates of FeugenPlate Legs
Cincture of PolarityCloth Waist
Cover of SilenceLeather Head
Cowl of Sheet LightningCloth Head
Faceguard of the SuccumbedPlate HeadHeadpiece of Fungal BloomLeather Head
Pauldrons of the AbandonedMail Shoulder
Riveted Abomination LeggingsPlate Legs
Sabatons of EndurancePlate Feet
Spire of SunsetTwo-Hand
Torment of the BanishedOne-Hand
Wraps of the PersecutedCloth HandsSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Thaddius this reset.