Redistributor is part of the Imperial City DLC. The crafting station is located in the Imperial City (Arboretum District). You can craft any armor, weapon or jewelry of this set in any motif style you know, as long as you have 7 traits researched (per item). You can trade crafted pieces to other players. Each set item becomes bound on equip.
If you need more information about the Imperial City, make sure to check out the full Imperial City Guide