Storan

Location
is the Mystery Merchant you will find in various locations around Westonia.
 * Acarum
 * Entrance of Citadel of Torment, next to the puzzling monument
 * Glacial Bay Research Station
 * on board of ship stuck on The Maelstrom
 * Beacon Point Garrison (MM discord)
 * Lighthouse over Glacial Bay with airship platform in west part of Tempest Reach, Dreadspire teleportal location
 * Holdouts Redoubt up on the mountains west of Acarum
 * Bleakrock next to Flight Manager
 * Wayfarer Camp middle of Frost Reach
 * Icebase Stalker
 * very northeastern corner of Azurice Shrine

Mystery Merchant Shop
's shop information can be found in this list here

Trivia
The only Difference in the all of Arborea's Goblin merchants in the color of their backpack. has a what color Backpack?