Hallow's End

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TBC Patch 2.3.0 (2007-11-13): Added.
WotLK Patch 3.3.3 (2010-03-23): No longer drops from The Headless Horseman. Instead, you can get this mount from [Loot-Filled Pumpkin].

http://wowpedia.org/The_Horseman's_Reins

This rare mount can be looted from [Loot-Filled Pumpkin] which is awarded once per day to players who use the Dungeon Finder to form a group to kill the Headless Horseman during the Hallow's End seasonal event.