Chapter I: Trial of the Black Prince

Breath of the Black Prince Quest Guide!

Stage 1: Introduction

Seek out [npc=64144](A), [npc=65908](A), [npc=64047](H), [npc=66225](H), [npc=63218](N), [npc=64457](N), or [66409](N) to begin your journey.

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• Upon speaking to one of the NPC's above, you will receive [item=87261] and the quest to deliver it to Wrathion who can be found at the tavern in The Veiled Stair.
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• Wrathion will provide you with [quest=31454], and invite you to share a drink with him. Speak with Wrathion, who will then enter a short cinematic explaining the importance of your assistance.
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• When the cinematic has ended, you will be given two quests which you will need to complete to continue.
  
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Stage 2: First Steps

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• Trial of the Black Prince
  This quest requires you to obtain honored reputation with The Black Prince. A new faction will appear in your reputation tab, and reputation can be earned by killing Mogu/Matid enemies in the Vale, Townlong, or the Dread Wastes.
  
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• Base Reputation Gain (Non-human, w/o [spell=78635], or [item=64401]):
  -Normal mobs = 10-12 rep
  -Elites = 15-30 rep
  -Weak Mobs = 1-3 rep
  -Rare Elites = 40-45 rep
  
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Note: If you do not wish to sit and farm reputation, it can easily be obtained while killing enemies for your Golden Lotus and Klaaxi dailies.
Rogues ONLY Note: If you have completed Patricide, you do not have to do this quest.

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• The Strength of One's Foes
  This quest will take significantly more time and dedication. To complete this quest you must first obtain:
  -10x [item=87208]
  -10x [item=87209]
  These sigils will drop from bosses located in Mogu'shan Vaults, the Heart of Fear, and Terrace of Endless Spring raids.
  
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Note: As of the time of writing, these sigils do in fact drop in LFR and currently do not drop more than one per boss.

Stage 3: Yes, This Will Do Nicely!
After completing both The Strength of One's Foes and Trial of the Black Prince, you will receive the quest Fear Itself from Wrathion.

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• Fear Itself
  To complete this quest you must kill the Sha of Fear in Terrace of Endless Spring, and loot the
  [item=87210]
  
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• Breath of the Black Prince
  After you've turned in your Chimera of Fear, speak to Wrathion once more and he will offer you a choice of the following legendary Gems:
  
  -[item=89873] +500 Agility
  -[item=89881] +500 Strength
  -[item=89882] +500 Intellect
  
  Note: These gems can only be placed into "Sha-Touched" weapons (See Below) and after turning in the quest, it is rumored that Wrathion will begin selling the gems to you at a currently unknown rate.
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Stage 4: Wrathion's War
More information will be added later as I continue to update this guide. Chapter 2 of the questline will be released in 5.1 so stay tuned for more information!

Note: [item=87212] appears to be the item responsible for turning an item into a legendary. It is unknown when this will become available, but I imagine it won't be until Chapter IV.

List of "Sha-Touched" weapons:

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• LFR
  [item=86864] (Agi Fist Weapon)
  [item=86865] (Int/Spi Mace)
  [item=86879] (Agility Staff)
  [item=86886] (Int Sword)
  [item=86889] (Gun)
  [item=86893] (Int Staff)
  [item=86905] (Str Axe)
  [item=86906] (Str Sword)
  [item=86910] (Agi Dagger)
  
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• Normal
  [item=86226] (Agi Fist Weapon)
  [item=86227] (Int/Spi Mace)
  [item=86321] (Agility Staff)
  [item=86328] (Int Sword)
  [item=86331] (Gun)
  [item=86335] (Int Staff)
  [item=86386] (Str Axe)
  [item=86387] (Str Sword)
  [item=86391] (Agi Dagger)
  
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• Heroic
  [item=86988] (Agi Fist Weapon)
  [item=86990] (Int/Spi Mace)
  [item=87156] (Agility Staff)
  [item=87164] (Int Sword)
  [item=87168] (Gun)
  [item=87170] (Int Staff)
  [item=87176] (Str Axe)
  [item=87173] (Str Sword)
  [item=87166] (Agi Dagger)
  
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The final Legendary will be a Gem of your choice giving you +500 of your chosen stat, the Gem choices are as follows:

Agility - Crystallized Dread

Strength - Crystallized Terror

Intellect - Crystallized Horror

Each Gem is a Reward Choice from the quest Breath of the Black Prince in which upon completion will also give you:

118,000 experience

75 reputation with The Black Prince

and the Achievement Chapter I: Trial of the Black Prince

Source of most information and a helpful guide: http://www.wowhead.com/news=209066/sha-touched-legendary-quest-guide-updated-for-5-1

After completing the last the part of the quest, Wrathion will sell you replacement gem's at a cheap price of 10000g if you talk to him.