Unfathomable Darkness in ESO is a Medium Armor Set, that you can get as an Overland drop in the Clockwork City.
Mechanical Acuity in ESO is a decent DPS Crafted Armor Set and its crafting stations are located in the Clockwork City.
Mad Tinkerer in ESO is a decent Shock DPS Overland, Light Armor Set, obtainable from the Clockwork City Zone.
Innate Axiom in ESO is a Crafted Armor Set, good for Hybrid Builds that use both Stamina and Magicka based Abilities.
Perfected Timeless Blessing in ESO is an Ability Altering Set, that you can get in the Asylum Sanctorium Trial.