Lucid Nightmare

I didn't see this info (apologize if it is already out there) but FYI, this mount does not fly.

The mount is looted from [object=272270]
There is a lot to be done before you can even enter that crypt. In this precise order:

• 
  
• Dalaran, Broken Isles:
  Read the [object=270855] found on the top floor of curiosities & moore in Dalaran
  
• Ulduar, Storm Peeks:
  Kill [npc=33293],
  Go to the top of the pile of scrap in the northwest corner of the room
  Find the [object=187562] on the mechanical gnome's head. Pull it, and a puzzle is displayed on the floor.
  The objective is forming a 20 x 20 patern of lights on the floor in the shape of a cogwheel:
  0000000******0000000
0000*00******00*0000
000***0******0***000
00****************00
0******************0
00****************00
000**************000
********************
********************
********************
********************
********************
********************
000**************000
00****************00
0******************0
00****************00
000***0******0***000
0000*00******00*0000
0000000******0000000
  Read the [object=272039]
  
• Temple of Ahn'Qiraj, Silithus:
  Use the [object=272046] all the way in the end of the temple, Map
  Play the game of mindcraft, and place each item five in-a-row.
  Read the [object=272061]
  
• Deepholm:
  get a (tailoring crafted) [item=10025] and go to the Deepholm (58.3 25.6) cave entrance.
  Go to Deepholm (63.8 22.5) inside the cave and use the [object=272161]
  Drop into the fissure and use [object=268063]
  Equip the [item=10025] and interact with [object=272163]
  Read the Inconspicuous Note.
  
• Gnomeregan, Dun Morogh:
  Go to [npc=16882] (map) inside Gnomeregan and read the [object=272166].
  Pull the levers up to form the code 1 2 2 2 1 7 6 5 9 7
  from left to right:
  [npc=16882] = 1
  [npc=124338] = 2
  [npc=124339] = 2
  [npc=124340] = 2
  [npc=124341] = 1
  [npc=124342] = 7
  [npc=124343] = 6
  [npc=124344] = 5
  [npc=124345] = 9
  [npc=124346] = 7
  Read the Inconspicuous Note
  
• Val'sharah, Broken Isles:
  Go inside the house at Val'sharah (66 36.5)
  Click the [object=272173] and play a mini game where you untangle red wires into blue wires.
  Just switch a globe connected to a tangled wire with the globe that is closest to the untangled end.
  Read the [object=272181]
  
• Kun-Lai Summit, Pandaria:
  Go to Kun-Lai Summit (53 49) and enter the Tomb of Secrets.
  Prepare to spend an hour in [zone=8980],a maze with shifting walls.
  Use the [object=272249] Kun-Lai Summit (52.82 52.14)
  Next, bring the [object=272212] to a [object=272219]
  [object=272210] to [object=272217]
  [object=272211] to [object=272215]
  [object=272213] to [object=272218]
  [object=272214] to [object=272216]
  Go to the next chamber and read the Inconspicuous Note
  

You can track your progress with this macro:
/run local N,t,d={"Dalaran","Ulduar","Ahn'Qiraj","Deep","Gnomer","Val'sharah","Kun-Lai"},{47826,47837,47841,47850,47852,47863,47881} for s,k in pairs(N)do d=IsQuestFlaggedCompleted(t) print(k,"=",d and "" or "NOT","Done")end

Great mount for my Shadow Priest, really fits the "lore" and the Priest's shadow effect gives the mount the glowing purple effect it's feet, horn, and tail have over the rest of its body as well. Not that hard to obtain, just requires a lot of travel and puzzle solving that can be very time consuming... Two words: Temple Maze (it will haunt your dreams).