Several new Spells named Studying have been discovered, specifying "Khaz Algar" Knowledge - meaning Dragon Isles Knowledge won't be applicable.
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The start of an expansion is always an exciting time, between leveling characters, discovering new locations and stories, and learning new Professions. Those who have an excess amount of Profession Knowledge won't get to carry it forward to The War Within, though - players will be starting from scratch with their Professions.