Item Sets

In, there are a number of armor sets. Wearing enough of the armor set grants certain bonuses, depending on the set.

Death's Wind

 * Eastshore Islets Camp (Auridon)
 * Chill House (Glenumbra)
 * Armature's Upheavel (Stonefalls)

Night's Silence

 * (Auridon) - Hightide Keep
 * (Glenumbra) - Mesanthano's Tower
 * (Stonefalls) - Steamfont Cavern

Ashen Grip

 * Auridon: Beacon Falls
 * Glenumbra: Par Molag
 * Stonefalls: Magmaflow Overlook

Torug's Pact

 * Grahtwood: Fisherman's Isle
 * Stormhaven: Hammerdeath Workshop
 * Deshaan: Lak Hlaalu Retreat

Twilight's Embrace

 * Grahtwood: Vineshade Lodge
 * Stormhaven: Windridge Warehouse
 * Deshaan: Avayan's Farm

Seducer Set

 * Grahtwood: Temple of the Eight
 * Stormhaven: Fisherman's Island
 * Deshaan: Berezan's Mine

Magnus' Gift

 * Greenshade: Arananga
 * Rivenspire: Vaewend Ede
 * Shadofen: Xal Haj-ei Shrine

Hist Bark

 * Greenshade: Rootwatch Tower
 * Rivenspire: Trader's Rest
 * Shadowfen: Hatchling's Crown

Dropped Sets
Sets:

Akaviri Dragonguard:

 * Effect: Dragon Flames (3 items)
 * Bastion of the Dragon (Shield) (Off-Hand)
 * Claw of the Dragon (Sword) (One-Handed)
 * Crest of the Dragon (Head) (Heavy Armor)
 * Scales of the Dragon (Chest) (Heavy Armor)

Armor of Rage:

 * Effect: Berserker (3 items)
 * Cuirass of Rage (Chest) (Heavy Armor)

Darkstride:

 * (With 3 or more items equipped): +7 Stamina Recovery.
 * (With 5 or more items equipped): "Darkstride" Effect: Stamina cost for Sprinting and crouching reduced by 20%

Fiord's Legacy:

 * Fiord's Legacy: Sprint Cost reduced by 15%

Ice Furnace:

 * Effect: Frostfire (3 items)
 * Ice Furnace Cuirass (Chest) (Heavy Armor)
 * Ice Furnace Greaves (Legs) (Heavy Armor)
 * Ice Furnace Pauldrons (Shoulders) (Heavy Armor)
 * Ice Furnace Sabatons (Feet) (Heavy Armor)

Knightmare:

 * Effect: Knightmare (3 items)
 * Cuirass of the Knightmare (Chest) (Heavy Armor)
 * Gauntlets of the Knightmare (Legs) (Heavy Armor)
 * Greaves of the Knightmare (Hand) (Heavy Armor)

Necropotence:

 * (3 items) +15 Health Recovery
 * (5 items) (If pet active) Max Magicka increased 10%

Seducer

 * Craftable: Temple of the Eight (Grahtwood)

Shrouded Armor:

 * 3 items: Blood Frenzy (+208 Health when activate an Ultimate Ability)
 * Mask of Shadows

Silks of the Sun:

 * Effect: Silks of the Sun (3 items)
 * Epaulets of the Sun (Shoulders) (Light Armor)
 * Robe of the Sun (Chest) (Light Armor)
 * Staff of the Sun (Flame Staff) (Two-Handed)

Syrabane's Grip:

 * 3 items: +100 Spell Resistance
 * 5 items: +70 spell resistance.

Thunderous Plate Mail:

 * Effect: Thunderous Heavy Plate (3 items)
 * Thunderous Cuirass (Chest) (Heavy Armor)
 * Thunderous Pauldrons (Shoulders) (Heavy Armor)
 * Thunderous ???

Vestments of the Warlock:

 * Effect: Magicka Flood (3 items)
 * Cowl of the Warlock (Head) (Light Armor)
 * Focus of the Warlock (Neck)
 * Robes of the Warlock (Chest) (Light Armor)
 * Signet of the Warlock (Ring)