WoWDB

This moose is obtained by killing Heroic or Mythic Archimonde (for a limited time only!).  The first time you kill him, he will drop  Remnant of Chaos which will send you to  Moonglade for a short quest chain that ultimately results in your sweet new ride.  This item drops for everyone in the raid (who hasn't already gotten it), so everyone can get their moose with just one kill.

This is the magical kind of moose that can fly.  It does not grow wings, but upon jumping will take flight.  In the air, his hooves begin oozing what looks like blue fairy dust (probably of Canadian origin), so that is clearly the science behind moose flight.

Quote from Tziva »

This is the magical kind of moose that can fly.  It does not grow wings, but upon jumping will take flight.  In the air, his hooves begin oozing what looks like blue fairy dust (probably of Canadian origin), so that is clearly the science behind moose flight.

Reminded me somewhat of the flying moose couch from "Return to Oz". *lol*

I loved that moose like no other moose before it.

As of the launch of the expansion, the Grove Warden moose mount will no longer be obtainable. However, players who have received their Remnant of Chaos by participating in a victory over Archimonde in the Hellfire Citadel on Heroic or Mythic difficulty but haven’t yet taken the Remnant to Moonglade will still be able to do so after the Legion launch. (Source)