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Green Death, also known as Merciless is the main antagonist from the first book of the How to Train Your Dragon book series and later became posthumous in the other books.


How to Train your Dragon

In the first book, the Green Death arrives on Long Beach with a smaller Seadragonus Giganticus Maximus (which he eats later on). Hiccup is sent to meet with him and asks if he comes in peace or war as he is the only one who can speak Dragonese.

When Hiccup says his name the dragon shivers subconsciously he seems however that Hiccup did not notice it nor did the Green Death itself. The dragon says he comes in peace but that he's still going to eat them all regardless. The Green Death and Hiccup discuss Singing Suppers, but during the conversation the Green Death moves in to eat Hiccup.

Just as this happens the Green Death yawns, and decides he is too tired to eat Hiccup right now, stating that he should come back in a few hours to be eaten. Hiccup then leaves and tells the tribe that the Green Death, while coming in peace, will still eat them. With the help of the other Hooligan and Meathead boys and their dragons, Hiccup creates a plan to kill the Green Death with the help of a second Seadragonus Giganticus Maximus, the Purple Death, which they trick into helping them.

In the following battle, the Purple Death is killed. However, the Green Death is fatally wounded. In anger, the Green Death swallows Hiccup whole. Fortunately, Hiccup avoids being digested by grabbing and holding on to a Roman spear stuck in the dragon's throat. While inside the Green Death, Hiccup discovers the fire holes (a dragon's source of fire) and blocks them with his helmet. Due to this, the Green Death blows up when he tries to burn Stoick, Hiccup, and Toothless. His death makes Hiccup a hero in the eyes of his tribe.

How to Steal a Dragon's Sword

In "How to Steal a Dragon's Sword", the Green Death was known as Merciless, the leader of the Dragon Rebellion in Hiccup Horrendous Haddock the First's time. Merciless saw in the future that he was to be killed by a human named Hiccup. He sent Wodensfang to kill Hiccup, but was instead betrayed by Wodensfang when Wodensfang discovers the good in Hiccup's heart. With the Dragon Jewel, Hiccup ordered Merciless to disband the Rebellion and become a loner.


Green Death appeared as a gigantic green dragon, as his name suggests. In the books, his teeth are 20 feet long, which would make his estimated size 990 feet long.


He is a very evil type. He even started the war between humans and dragons, since he is able to predict the future that he will be killed by Hiccup. When he got washed up by the shore he even wanted to kill everybody, but he failed.


           How to Train Your Dragon logo.png Villains

Alvin the Treacherous † | Furious † | Green Death † | Purple Death † | Norbert the Nutjob | Excellinor the Witch † | Hairy Scary Librarian | Snotface Snotlout † | Venomous Vorpent

Northern Alliance
Drago Bludvist † | Drago's Bewilderbeast | Eret's Crew (Eret) | Warlords

Dragon Flyers
Krogan † | Mr. Murderous Pile of Yak Dung | Flyer Leader

Dragon Hunters
Viggo Grimborn † | Ryker Grimborn † | Cleve | Ingar Ingerman † | Dragon Hunter Commander † | Fight Master

Outcast Tribe
Alvin the Treacherous | Mildew | Savage

Berserker Tribe
Dagur the Deranged | Savage

Red Death † | Boneknapper | Whispering Death | Skrill | Screaming Death | Slitherwings | Firecomb Crasher | Hookfang's Nemesis | Drago's Bewilderbeast | Deathgrippers

Grimmel the Grisly † | Johann † | Amos | Calder | Gruffnut Thorston

Rescue Riders
Magnus Finke | Slinkwing Trio (Lurke) | Waldondo del Mundo | Erik the Wretched | Svetlana the Sly