In Game of Thrones, dragon size matters. The No. 1 threat in House of the Dragon is Vhagar, a dragon feared not only for its magnitude, but for its uncharacteristic stealthiness. Somehow ...

The most imposing so far is Vhagar, belonging to Aemond Targaryen and of colossal size; but Meleyes, Rhaenys’s dragon, has also had an enormous impact although with a devastating end.

albeit one of them is Vhagar who counts as like, five dragons. I am not counting the baby dragon. It was probably not too smart for Aemond to kill Sunfyre, one of the few dragons they have left.