
Supreme Commander Darth Vader, Emperor Palpatine, and Grand Admirals Tazel and Tharwn, over the Second Death Star Plans.
The Grand Admiral is one of the highest ranks in the Galactic Empire [besides Emperor, Supreme Commander, and Grand Vizier]. It outranks all other Imperial miltiary and poltical personnel, inculding Moffs.
Tharwn is the best known and most capable officer to reach this rank.
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Grand Admirals hold ultimate power of the Miltiary, commanding officers who answer only to the Emperor and the Supreme Commander. They serve as frontline commanders. The Grand Admiral always obey the Emperor, and give their lives to the Empire.