Vaneva

Location
is the Mystery Merchant you will find in various locations around Val Palrada.
 * Frontera
 * Red Refuge teleportal in near Temple of Dagon
 * Quarantine Zone Research Center
 * in Quarantined Village southern edge hiding behind a broken carriage (MM discord)
 * Arachne's Bane near Arachnaea
 * Feral Valley Station (MM discord)
 * Experior Outpost
 * Emissary Point
 * Camp Venom near Temple of Dagon

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?