9 transmog appearances and 1 mount, pet or toy drop in Serpentshrine Cavern.
Belt of One-Hundred DeathsLeather Waist
Cobra-Lash BootsMail Feet
Fang of VashjOne-Hand
Glorious Gauntlets of CrestfallPlate Hands
Krakken-Heart BreastplatePlate Chest
Lightfathom ScepterOne-Hand
Runetotem's MantleLeather Shoulder
Serpent Spine LongbowRanged
Vestments of the Sea-WitchCloth ChestSign in with Battle.net to see which of these appearances and collectibles you already have, and which of your characters can still loot Lady Vashj this reset.