The Fel-Infused Corrupted Hippogryph
The Corrupted Hippogryph is obtained via a loot code from the Corrupted Hippogryph Loot Card. It teaches the use of the Corrupted Hippogryph epic flying mount. The Corrupted Hippogryph Loot Card is found in packs from the Crown of the Heavens Expansion Set.
The Corrupted Hippogryph will adjust to your highest level of trained flying skill. You must be at least level 20 with Apprentice Riding skill in order to use this mount.
The Corrupted Hippogryph loot is not bind on pickup, so it may be traded in-game or sold on the auction house before it's been used. The typical buyout price for this mount is usually about 2.2M Gold (as of Patch 8.0.1).
Corrupted Hippogryph Demo Video
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The Corrupted Hippogryph Loot Card is found in approximately 1 out of 264 packs, which makes it a very rare card.
Crown of the Heavens booster boxes run about $80.00 each and contain 6 packs of cards. At that rate, the estimated cost to acquire the Corrupted Hippogryph Loot Card if you were to try and pull it from a pack would be in upwards of $3500.00.
Average ebay price for the Corrupted Hippogryph loot card is only $550.00.