Ezart

Location
is the Mystery Merchant you will find in various locations around Essenia.
 * ruins near Tria where initial quest takes you, Rift's Edge teleportal location
 * Dorana Outpost (MM discord)
 * Windwhistle Woods, along the road from Allemantheia, next to fallen tree on curve of road
 * Garbi Outpost in Blightwood, south-west from Tria
 * Liberation Station in Essenian Crest
 * Stronghold of Blood in Essenian Crest, next platform to Kierhan (use Gossamer Vault teleport to travel)
 * Tralion, next to Pegasus Platform
 * Seekers' Locus in Blessing Basin
 * Crossroads Camp (MM discord)
 * Fountain of Shara

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?