Legion secrets

A number of secret or hidden objectives were introduced in Legion. This article seeks to list all of them:

Patch 7.0

 * Fathom Dweller and Hungering Claw - Kosumoth the Hungering
 * Vial of Green Goo - Endgineer Omegaplugg
 * Reins of the Long-Forgotten Hippogryph

Patch 7.2

 * Riddler's Mind-Worm - Riddle of the Mind-Seekers

Patch 7.2.5

 * Sun Darter Hatchling - Caverns of Consumption
 * Pebble (item) - Bring Dog from the Garrison to the Magical Menagerie in Dalaran

Patch 7.3.0

 * Lucid Nightmare - Riddle of the Lucid Nightmare
 * Lost Mail

Patch 7.3.5

 * Doomsayer's Robes
 * Uuna's Doll