Chapter 31: The Mad Nadder

Tropes That Appear In This Chapter:

Bad Boss: Its established that as the Red Death's influence has expanded and its hunger growing by the day, all of the other dragons are being starved.
Cargo Ship: invoked Played for Laughs. When she considers discarding her axe to help train the Nadder, Astrid starts shedding tears.
"Forgive me... my love..."
Rage Breaking Point: Before going through with her plan to train a dragon, Astrid pauses and wonders if she should. She then remembers that, with Stoick and Gobber in shut-down mode, Spitelout and Snotlout have become the village leaders. This fact is enough to make her go through with her plan.
The Reveal: It's revealed here that with Toothless gone from the nest, the amount of food looted had gone down, hence why Red Death sends the dragons on more frequent raids to compensate.
Violence Is Not an Option: At first Astrid refuses to take the manual's advice, thinking that going after a dragon without a weapon is suicide. When the excitable Nadder refuses to cooperate, it isn't until she decides to take Hiccup's instructions seriously does she make any progress.