Knuckerbocker

Knuckerbocker is an Equestrian dragon from the Isles of Scaly in Draconia and is one of the oldest living dragons in Equestria living during the post-Chaos War era was the original owner of Knuckerbocker's Shell, a relic currently kept in the School of Friendship by Professor Spoonful which can summon a dragon army when it's blown into. First introduced to have helped Daring Do reach the Isles of Scaly in Chapter 10 of Daring Do and the Eternal Flower, "Travel the Scales", he is said to have been a renowned dragon general for one of Draconia's rulers before King Drakesis, creating the shell with the help of a magical sea dragon to fight against the most dangerous of dragon overlords.