5 transmog appearances in The Mechanar.
Beast Lord HelmMail Head
Jade-Skull BreastplatePlate Chest
Manual of the NethermancerHeld In Off-hand
Moonglade RobeLeather Chest
StellarisOne-HandSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Nethermancer Sepethrea this reset.