So I’m working on the Deciphering Death’s Intentions achievement but I don’t know how to get the Coldheart Flight Routes and Shadehound Armor Plating.
Does anyone know how to get them? Like what they drop from or if they are items that you can pick up from the ground at a certain spot in the Maw?
Coldheart Flight Routes is a random drop from pretty much any mob in the Maw (slightly higher chance from rares/events mobs?). Nobody seems to know where Shadehound Armor Plating is yet. 
Thanks for letting me know how to get the Coldheart Flight Routes. And for explaining how the Shadehound Armor Plating is currently MIA.
I think I saw on wowhead that the shadehound armor may only be available of shadehounds during the hunt event. Low drop rate but I may be wrong.