From WoWWiki

Tier 6 mage armor is collectively known as Tempest Regalia.

Source

The Tempest Regalia Head, Hands, Legs, Shoulders, and Chest items are sold by Tydormu in the Battle for Mount Hyjal instance and the Wrist, Waist, and Feet items are sold by Theremis, present on a boat in the Sun's Reach Harbor of the Isle of Quel'Danas. They are "purchased" with Tokens of the Forgotten Vanquisher.

Slot	Token	Dropped by	Found in
Head	1	Archimonde	Battle for Mount Hyjal
Hands	1	Azgalor	Battle for Mount Hyjal
Legs	1	Illidari Council	Black Temple
Shoulders	1	Mother Shahraz	Black Temple
Chest	1	Illidan Stormrage	Black Temple
Wrist	1	Kalecgos	Sunwell Plateau
Waist	1	Brutallus	Sunwell Plateau
Feet	1	Felmyst	Sunwell Plateau

Items

Tempest Regalia

Cowl of the Tempest Binds when picked up Cloth Head 199 Armor +30 Stamina +40 Intellect +28 Spirit Meta Socket Yellow Socket Socket Bonus: +6 Stamina Durability 60 / 60 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 13. Equip: Improves spell critical strike rating by 29. Equip: Increases damage and healing done by magical spells and effects by up to 62. Set: Tempest Regalia (1/8)	Gloves of the Tempest Binds when picked up Cloth Hands 153 Armor +30 Stamina +26 Intellect +21 Spirit Yellow Socket Socket Bonus: +2 Spell Damage Durability 35 / 35 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 20. Equip: Improves spell critical strike rating by 19. Equip: Increases damage and healing done by magical spells and effects by up to 46. Set: Tempest Regalia (1/8)
Leggings of the Tempest Binds when picked up Cloth Legs 214 Armor +36 Stamina +47 Intellect +29 Spirit Blue Socket Socket Bonus: +2 Spell Damage Durability 75 / 75 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 20. Equip: Improves spell critical strike rating by 29. Equip: Increases damage and healing done by magical spells and effects by up to 62. Set: Tempest Regalia (1/8)	Mantle of the Tempest Binds when picked up Cloth Shoulder 183 Armor +27 Stamina +27 Intellect +21 Spirit Blue Socket Yellow Socket Socket Bonus: +4 Spell Damage Durability 60 / 60 Classes: Mage Requires Level 70 Equip: Improves spell critical strike rating by 21. Equip: Increases damage and healing done by magical spells and effects by up to 46. Equip: Increases your spell penetration by 18. Set: Tempest Regalia (1/8)	Robes of the Tempest Binds when picked up Cloth Chest 244 Armor +36 Stamina +39 Intellect +31 Spirit Yellow Socket Yellow Socket Blue Socket Socket Bonus: +5 Spell Damage Durability 100 / 100 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 13. Equip: Improves spell critical strike rating by 23. Equip: Increases damage and healing done by magical spells and effects by up to 62. Set: Tempest Regalia (1/8)
Boots of the Tempest Binds when picked up Cloth Feet 177 Armor +21 Stamina +29 Intellect +20 Spirit Yellow Socket Socket Bonus: +2 Spell Damage Durability 50 / 50 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 15. Equip: Improves spell critical strike rating by 20. Equip: Improves spell haste rating by 25. Equip: Increases damage and healing done by magical spells and effects by up to 50. Set: Tempest Regalia (1/8)	Bracers of the Tempest Binds when picked up Cloth Wrist 113 Armor +18 Stamina +17 Intellect +14 Spirit Red Socket Socket Bonus: +2 Spell Critical Strike Rating Durability 35 / 35 Classes: Mage Requires Level 70 Equip: Improves spell critical strike rating by 11. Equip: Improves spell haste rating by 26. Equip: Increases damage and healing done by magical spells and effects by up to 39. Set: Tempest Regalia (1/8)	Belt of the Tempest Binds when picked up Cloth Waist 145 Armor +19 Stamina +29 Intellect +20 Spirit Yellow Socket Socket Bonus: +2 Spell Damage Durability 35 / 35 Classes: Mage Requires Level 70 Equip: Improves spell hit rating by 14. Equip: Improves spell critical strike rating by 17. Equip: Improves spell haste rating by 29. Equip: Increases damage and healing done by magical spells and effects by up to 50. Set: Tempest Regalia (1/8)

Mage sets
Dungeon		1: Magister's Regalia • 2: Sorcerer's Regalia 3a: Incanter's Regalia • 3b: Mana-Etched Regalia
Reputation		ZG: Illusionist's Attire • AQ20: Trappings of Vaulted Secrets • AQ40: Enigma Vestments • Evoker's Silk Battlegear
Tier (Raid)	1/2/3	Arcanist Regalia • Netherwind Regalia • Frostfire Regalia
	4/5/6	Aldor Regalia • Tirisfal Regalia • Tempest Regalia
PvP-	AB	The Highlander's Intent • The Defiler's Intent
	Rare	Lieutenant Commander's Arcanum • Champion's Arcanum
	Epic	Field Marshal's Regalia • Warlord's Regalia
Arena		1: Gladiator's Regalia • 2: Merciless Gladiator's Regalia • 3: Vengeful Gladiator's Regalia • 4: Brutal Gladiator's Regalia