Augment

An augment is a special enchant-granting item that does not require the services of an enchanter to apply. Augments are available from a number of sources, including quests, faction quartermasters, blacksmiths, engineers, leatherworkers, and tailors.

Augments and enchantments do not stack. Applying any enchant, either from an augment item or enchanter, will overwrite any previous enchantment. Temporary effects like rogue poisons, oils, sharpening stones and shaman spells will not erase a permanent augment or enchantment.

Inscriptions

 * Not to be confused with the primary profession Inscription, introduced in Patch 3.0.2, Echoes of Doom.

Mists of Pandaria
Shoulder inscriptions are now made by the Inscription profession. Unlike previous expansions, there is no longer a faction that awards them at a certain reputation level, like Sons of Hodir or Therazane. This was done to avoid forcing all endgame-focused players to grind reputation with that faction.

Scribes can also create augments that they can used themselves that has extra stats.

Cataclysm
Cataclysm inscriptions are shoulder enchant items rewarded from high level reputation status with Therazane in Deepholm. All inscriptions require level 85, can only be placed on items you own (they cannot be applied through the Trade window), and will soulbind any items that are not already soulbound if applied. All inscriptions cost before any factional discounts.

Northrend
Northrend inscriptions are shoulder enchant items rewarded from high level reputation status with the Sons of Hodir in Storm Peaks. All inscriptions require level 80, can only be placed on items you own (they cannot be applied through the Trade window), and will soulbind any items that are not already soulbound if applied. The lesser inscriptions cost and the greater inscriptions cost  before any factional discounts.

Also available are PvP-based inscriptions from Wintergrasp vendors for a cost of each:

Outland
Inscriptions grant enchants to shoulder armor. They are purchased from Aldor and Scryer vendors in their respective banks in Shattrath City. Inscription of Endurance is also available from Apprentice Darius outside Karazhan through The Violet Eye reputation. For the Aldor/Scryer inscriptions, uncommon inscriptions can be purchased for 2 tokens, rare greater inscriptions cost 8 tokens. Tokens are obtained by turning in Fel Armament (Aldor) or Arcane Tome (Scryer) to the corresponding NPC in Shattrath. Inscriptions require level 64 and reputation with their respective faction, and greater inscriptions require level 70 and. Inscriptions can only be placed on items you own (they cannot be applied through the Trade window), and will soulbind any items that are not already soulbound if applied.

Lore
The first arcanum that came to be were apparently created by the trolls and stolen by the high elves about 2800 years ago during the Troll Wars. The elves, well versed in the ways of magic, could not understand why the troll's weapon enchantments of voodoo were stronger than the elven magic. As a solution, they stole magic and knowledge from troll spellcasters such as Zanza and imbued them into idols to create their own enchantments against the trolls. These enchantments were called "Arcanum".

Mists of Pandaria
Head enchants were removed in patch 5.0.4.

Cataclysm
Cataclysm Arcana cost before the faction discount. They are heirloom items and require level 85. The three primary neutral factions and the Dragonmaw Clan/Wildhammer Clan faction offer arcana at.

Northrend
Northrend Arcana cost either before the faction discount for the faction-based arcana or  for the arcana purchased from Wintergrasp vendors. They are all of rare quality and require level 80. The four primary neutral factions offer arcana at and  (as like the primary instance factions in Burning Crusade), while the Alliance Vanguard/Horde Expedition arcana require  and the Wintergrasp arcana have no requirement other than control of Wintergrasp itself in order to purchase the arcanum. Arcana can only be placed on items you own (cannot be applied in the trade window), and will also soulbind any items that are not already soulbound if applied.

Outland
Outland arcana are items that grant enchants to head armor. They are all of uncommon quality and require level 70. The reward for being Honored is +20 resistance to a specific school, while the reward for Revered is a pair of stat enchants. Each arcanum is sold for before faction discounts. Arcana can only be placed on items you own (cannot be applied in the trade window), and will also soulbind any items that are not already soulbound if applied.

Classic
Like the lesser arcanum, these items granted an enchant to a head or leg item. They were acquired from Libram drops in Dire Maul. The libram and various ingredients were turned in to Lorekeeper Lydros in the Dire Maul library.

Each turnin required a libram, a quest item, a Pristine Black Diamond and a few Large Brilliant Shards

Lesser Arcanum
Lesser arcanum granted an enchant to a head or leg item. They could be acquired from Libram world drops. The libram and various ingredients were turned in to Mathredis Firestar in Burning Steppes.

Each turn-in required a libram, a Black Diamond, and a few quest items.

Zul'Gurub
Leg/head class-specific augments were obtainable from Zanza the Restless in Zul'Gurub. Each augment requires:
 * Primal Hakkari Idol - dropped by Bloodlord Mandokir and/or Jin'do the Hexxer
 * Punctured Voodoo Doll - Class-specific, found in Jinxed Hoodoo Piles scattered about in Zul'Gurub

Guards
Guards are augments (Ice and Shadow Guard are acquired from Argent Dawn using Scarlet Crusade Insignias) that grant a head or leg enchantment giving +10 resistance to a school of magic.

Mantles
Mantles are augments that grant a shoulder enchantment giving +5 resistance to a school of magic. Nearly all of them can be purchased for after becoming Revered with the Argent Dawn and turning in 10 Valor Tokens; the exception is the Chromatic Mantle, which costs  and requires Exalted and 25 Valor Tokens. Mantles can only be placed on items you own, and placing one on a non-soulbound item will bind it to you.

Fishing Line
High Test Eternium Fishing Line grants +5 Fishing to a fishing rod. It can be acquired by catching Dezian Queenfish and completing Rare Fish - Dezian Queenfish during the Stranglethorn Fishing Extravaganza.

Spun Truesilver Fishing Line grants +3 Fishing to a fishing rod. It is one of many possible rewards found in the Bag of Fishing Treasures from the 2.4 Daily Fishing quest.

Ancient Fishing Line drops from Slithon the Last in Mac'Aree.

Weapon Chains
Weapon chains are weapon augmentations that decrease the duration of disarm effects on the wielder as well as, in one case, increase parry chance. Weapon chains are created by blacksmiths, similarly to shield spikes and spurs.

Spurs
Spurs are augmentations that are attached to feet items and increase mounted speed. At this time, there is only one form of spur; Mithril Spurs, which increases mounted speed by 4%. These are made by blacksmiths and since 2.4.2, do not need to be attached by blacksmiths.