PTR 2 Professions & Skills
Skill #554 (possibly named "Undead Horsemanship") doesn't exist. It may have been removed from the game.
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Undead Horsemanship - Classic
Undead Horsemanship - Burning Crusade
Undead Horsemanship - Wrath of the Lich King
Undead Horsemanship - Cataclysm
Undead Horsemanship - ClassicUndead Horsemanship - Burning CrusadeUndead Horsemanship - Wrath of the Lich KingUndead Horsemanship - Cataclysm