Treasure Contract: Explosive Discoveries [Breaching the Barrier]
Channel: Phoenix Gaming
Date: 2015-03-18

http://www.wowhead.com/quest=37881

If you don't have the  Reins of the Azure Water Strider, make sure to have a few  Elixir of Water Walking/ Draenic Water Walking Elixir

Fly to Socrethar's Rise or Darktide Roost fly point.

If you don't have either of these, you can fly to Twilight Glade, in Shadowmoon Valley.
Then travel south to Darktide Roost.

1.  Treasure Contract: Explosive Discoveries
• The coordinates for Demolitionist Megacharge are located in the vicinity of 56.3,91.9
• Kill him and loot the  Megacharge's Cookbook.

2.  Dark Grimoire: The First Ingredient
• Travel up the hill to the coordinates 63.7,93.9 for the Precision Blasting Powder.

3.  Dark Grimoire: The Second Ingredient
• Travel to the waters between Darktide Roost and Socrethar's Rise at coordinates 50.5,89.6.
• Go underwater to click the  High Voltage Detonator.

4.  Dark Grimoire: The Final Ingredient
• Travel to Socrethar's Rise roughly to coordinates 49,82.
• Any demons here will drop the  Demon's Blood, but I've found the best targets are the Fel Imp due to the low health of less than 10k and their numbers.

5.  Dark Grimoire: Breaching the Barrier
• After you have collected all 5  Demon's Blood, travel to coordinates 43.9,77.5, grab the flight point if you don't already have it.
• Travel to coordinates, 42.6,74.1, by going up the hill next to the flight point and jumping down one ledge at a time.
• Click the cave's "instanced entrance" and enter (avoid touching the light beams and circles on the ground).
• The best course I've found it on jumping over the beams and hugging the right side of the wall.
• Loot the  Grimoire of the Nameless Void, and turn in the quest at your garrison.


CREDITS:
"Summon the Rawk" Kevin MacLeod (incompetech.com) 
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/