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A middleweight combat dragon, typically part of Excidium's formation. Prior to the Battle of Trafalgar, Auctoritas (Latin for 'authority') was detached and remained behind at the Dover covert, along with Crescendium and Temeraire, to protect the English Channel.
Despite this, Auctoritas died of the dragon plague not long after Lily's formation left for Africa.
Auctoritas is Latin for "authority, power, command".