This is the modded version of the promotional Set called Dark Wanderer.
It seems that obtaining this set also unlocks the transmog.
Diablo 3 Mods & Modded Items for Xbox One, PS4 (Playstation), N Switch with near instant delivery. Reaper of Souls Mods for all classes including Monk, Wizard, Necromancer, Barbarian, Crusader, Witch Doctor, Demon Hunter.
These items hold no monetary value; our service finds/locates the items you’re looking for and we work with you on how you want to obtain them.
Diablo Immortal Set and Items, Diablo 3 ROS, Diablo 3 Immortal