Dragon Manual

The Dragon Manual is a Viking encyclopedia of all dragon species discovered by the Hairy Hooligans tribe. Considered an important piece of knowledge, it is how the Vikings of Berk know the weaknesses and methods needed to take down some of their reptilian attackers.

Contents
The Dragon Manual contains entries on all of the dragons that the Hairy Hooligans know of, written in Viking runes. Each dragon in the Manual has its size, speed, habitat, and method of attack documented, along with an illustration of the dragon itself. After each dragon's individual information with the exception of the Night Fury, the Manual warns the reader that each dragon is extremely dangerous and must be "killed on sight". Some examples of the beasts inside include the Hideous Zippleback, the Monstrous Nightmare, the Gronckle, the Terrible Terror, the Boneknapper and the Scauldron to name a few. Other dragons such as the Whispering Death are mentioned in the Manual when Hiccup reads through it, but they are never explicitly named or shown. The only dragon not to be fully documented is the Night Fury.

Role In The Film
The Dragon Manual is given to the students of Dragon Training in order for them to study up on the dragons they will be facing in future sessions. Apart from Astrid and Fishlegs who have already read it, the rest of the group don't appear to be keen to study the Manual. Later on that same night, Hiccup returns to the village hall to try and find any information on Night Furies, hoping to use the book to try and approach the one he shot down. The Manual proves to be fruitless, only warning him that Night Furies are considered too dangerous to try and kill and should be avoided at all costs.