|“||The dragon Furious called his second in-command to him, a luminously beautiful Sea-Dragon slightly smaller than himself, known as Luna. She was so-called because she glowed with light like the moon. She lit up the dark storm clouds all around, and waves of heat pulsed out of her, so that the rain smoked and hissed when it landed on her shining body.||”|
|— How to Fight a Dragon's Fury|
Luna is a female Seadragonus Giganticus Maximus who appears in How to Fight a Dragon's Fury. She was Furious's second in command, but when he went away, he left Luna in charge. It is under her reign that the dragons disappear. She is white and glows, hence her name. In book 12, How to Fight a Dragon's Fury, Luna is ordered by Furious, the leader of the dragon rebellion, to "Send your best and most ruthless dragons through Hero's Gap to look for the boy (Hiccup)" She is also told not to go herself, as "it is harder to harden your heart than you think. Particularly against well- meaning humans like Hiccup. "
- "Luna" means moon.