Merely a Set

Well played, Blizzard, well played.

The 5 Piece, Tier 5 sets from Serpentshrine Cavern and The Eye are token based, shared across the classes:

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• Druids, Priests and Warriors share tokens of the vanquished defender
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• Hunters, Mages and Warlocks share tokens of the vanquished hero
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• Paladins, Rogues and Shaman share tokens of the vanquished champion
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• Headpiece tokens drop from Lady Vashj
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• Glove tokens drop from Leotheras The Blind
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• Leg tokens drop from Fathom-Lord Karathress
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• Shoulder tokens drop from Void Reaver
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• Chest tokens drop from Kael'thas Sunstrider
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[class=1] - Protection - Destroyer Armour
[class=1] - Arms / Fury - Destroyer Battlegear
[class=2] - Protection - Crystalforge Armour
[class=2] - Retribution - Crystalforge Battlegear
[class=2] - Holy - Crystalforge Raiment
[class=7] - Enhancement - Cataclysm Harness
[class=7] - Restoration - Cataclysm Raiment
[class=7] - Elemental - Cataclysm Regalia
[class=3] - All specs - Riftstalker Armour
[class=4] - All specs - Riftstalker Armour
[class=11] - Feral - Nordrassil Harness
[class=11] - Restoration - Nordrassil Raiment
[class=11] - Balance - Nordrassil Regalia
[class=9] - All specs - Corruptor Raiment
[class=5] - Disc / Holy - Avatar Raiment
[class=5] - Shadow - Avatar Regalia
[class=8] - All specs - Tirisfal Regalia

As of 7.2, tokens can be clicked to automatically create the item based on your loot specialization, bypassing the need to visit a tier vendor.

Tokens "of the Vanquished" can be turned in for Tier 5 PvE sets or Season 2 PvP sets.

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• PvE: go to your Aldor or Scryer vendor (Aldor: [npc=21906], Scryer: [npc=21905]). If neutral, talk to whichever.
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• PvP: [npc=26091] is on the upper level of the Sun's Reach Armory on the Isle of Quel'Danas.
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Tokens are separated by class into 3 groups (this tier is not available for death knights, monks, or demon hunters):

• Champion: Paladin/Rogue/Shaman
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• Defender: Warrior/Priest/Druid
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• Hero: Hunter/Mage/Warlock
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Helm - [npc=21212]
Serpentshrine Cavern

[item=30242]
[item=30243]
[item=30244]

Shoulder - [npc=19516]
Tempest Keep

[item=30248]
[item=30249]
[item=30250]

Chest - Kael'thas Sunstrider
Tempest Keep

[item=30236]
[item=30237]
[item=30238]

Gloves - [npc=21215]
Serpentshrine Cavern

[item=30239]
[item=30240]
[item=30241]

Legs - [npc=21214]
Serpentshrine Cavern

[item=30245]
[item=30246]
[item=30247]

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Criteria of the meta Azeroth's Next Top Model, wowhead wrote up a full guide for the pve sets here.