Seeing Red

This quest-line, new to Patch 10.1.7, will unlock Man'ari themed customization for Draenei characters.
It's worth noting that this can be completed on any Lv70 character, regardless of race or faction.
If you haven't already, you'll need to complete the first part of the Legion Argus story campaign, The Assault Begins.

Start the quests by talking to [npc=209790](A) / [npc=209803](H) in your respective Capital.

• Prophecy Stirs
• 
  
• Uncertainty
• 
  
• Opening Wounds
• 
  
• Contrition
• 
  
• [quest=77789]
• 
  
• Proof and Promise
• 
  
• Scavenged Artifacts

Once finished, you will also unlock [spell=421107], allowing for the purchase of cosmetics from [npc=125246]:

• [item=206195]
• 
  
• [item=208755]
• 
  
• [item=208688]
• 
  
• [item=208686]
• 
  
• [item=208685]
• 
  
• [item=208683]
• 
  
• [item=208677]
• 
  
• [item=208662]

After completing the quest chain, a set of NPC "Ally of Arzaal" become available and will grant you a [item=208691] containing Argus crafting materials.

List of all allies of [npc=208894] and their locations:

Eranthi - Antoran Wastes (58.9, 23.7)
Heraat - Krokuun (56.4 ,52.2)
Saatilu - Krokuun (61.5 ,28.7)
Tronaar - Eredath (51.9, 67.9)
Yazdan - Antoran Wastes (53.8, 52.9)
Zyaana - Eredath (55.0, 27.8)

For people trying to get all the cosmetics after the Seeing Red (account) achievement, FIRST start doing the Argus story quests. You only need to complete quests until the 1st chapter of the story (The Assault Begins of the You Are Now Prepared! achievement). Do NOT start killing rares, looting treasures, and clearing invasion points before you take these 2 quests!

Why do the Argus story quests?
After you complete the Assault Begins quests, you can take both Fuel of a Doomed World, which gives 300 [currency=1508], and Invasion Point Offensive, which gives 250 [currency=1508]. The second quest is unlocked first. Clearing invasions gives a lot of [currency=1508].

How to start the Argus story quests?
Go to the Legion Dalaran at Krasus' Landing and do Assault on Broken Shore from Khadgar. If you have done the assault scenario before, just click on the dialog option that skips it (Khadgar has to do his walk first). After you teleport at the Broken Shore after the scenario, go back to Dalaran in the Violet Citadel and take The Hand of Fate from Khadgar. This is the start of the Argus story quests.