https://www.youtube.com/watch?v=sMXtg1RQ-bM Part 2
https://www.youtube.com/watch?v=ypa-wyV-0L8 Part 3
https://www.youtube.com/watch?v=2oRgrLCbdwM Part 4
Easiest way to get straight to the questline
.But gotta go check Drek'thar out first south of the Broken Shore and go follow everyone else to the cave with the cave-in being a demon hunter and glide in or mage to blink in and out or die and run in and rez. Go to the back of the cave and when you reach it find the pile of dirt and get the old relic and bring it back to Drek annoy him a bit and then you can begin part 1 to finding it
. Currently if you are in the us its the pet. Outside of the us it is the mount as far as I heard.