Wake the Dragon

Wake the Dragon is obtainable from finding, killing and then mounting the rare spawn stormdrake named Stormtalon. EDIT: Updated to add the NPC - looks like it was added to the Wowhead Database 5/22/16 - woot!

Stormtalon is a rare 110 located in Stormheim. He is found sleeping on a rock
See image here for location.
Update: It appears his spawn can move. I also found him here. And 1 more here.

When fighting Stormtalon, he will cast a melee attack, Electrified Scales, and a Lightning Breath. I was able to kill him as a 104 Havok DH on 5/19/16 by using all my CDs.

When you kill him, you get the green arrow like you were to mount a vehicle. If you click on him, you are granted a buff called [spell=218964]. This allows you to ride fly around on your temporary mount for 5 minutes at 150% mount speed.

He did not drop any loot when I killed him, as he didn't technically die.

Something noteworthy to add: You cannot leave the area you capture him in or you will be dismounted. Be prepared to use your [item=131811] or a Goblin Glider Kit for a safe landing!

Edit to add information:

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• If you are in a group, only one of you will be able to actually ride Stormtalon. It appears you will not be able to share the achievement with other players in your party.
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• Appears that respawn is pretty random; was instantly the first time I killed him, but I went back the second time and it was 10+ mins. And it appears that (at least as of 9/3/16) that it may be closer to 10-20 mins (thanks Jai74)
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Just killed him and instead of being able to mount him, he just disappeared. The world quest for that zone is currently up, not sure if this has anything to do with it.

Hopped on him and promptly tried flying across the little body of water to the big fire, only to get dismounted right away.