The Crystal Ball is a magical item that can reveal a targeted area, also unmasking invisible units. It lasts 10 seconds.
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Third War
Grommash Hellscream found one during the invasion of Ashenvale by his Warsong clan during the Third War when he raided a dark troll settlement near the Ashenvale / Barrens borderline.[1]
Legion
Years later, now known as the [Astranaar Globe], it was found by Archmage Vargoth and eventually taken by the leader of the Tirisgarde.[2]