Seadragonus Giganticus Maximus

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Seadragonus Giganticus Maximus
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Tough, Tough, Tough...19
Fear and fight factor:
Very Powerful...10
It is actually,for its size, fast...8
Unimaginable ...10

The Seadragonus Giganticus Maximus is a type of dragon. These "preposterously huge" fire-breathing dragons are the size of a mountain, and are very dangerous; they kill for sport. When a Seadragon appears on the beach looking for a fight, Hiccup is the only one with a plan to save the tribe.

Seadragonus Giganticus Maximus are known to posses powers of telepathy and limited ability to see the future. They can breathe fire continuously for at least an entire night, which is powerful enough to dramatically alter landscapes. One Seadragon, Wodensfang, has demonstrated possession of retractable teeth.

The promise of a Seadragonus Giganticus Maximus is considered to be unbreakable, although in practice there is nothing to ensure it.

Physical Appearance

Seadragonus Giganticus Maximus are huge, blue, green, or purple, and covered in marine corals, anemones, and shells. However as it is discovered in How to Betray a Dragon's Hero, these dragons have wildly varying size. They start off extremely small, grow to impossibly huge size, and sometimes shrink down to the earlier extremely small size. It is unknown why the similarly aged Green Death and Wodensfang were so differently sized. Possibly dietary differences control it.

The Green Death/Merciless

Main article: Green Death

A dragon that might be Merciless as shown on the cover of How to Train Your Dragon. Note that the Viking helmet in his talons is completely disproportionate if it is him.

The Green Death (or formerly known as Merciless) is the most well-known Seadragonus Giganticus Maximus. It claims, in the book, that it is an artist by eating other dragons, and is very proud of its size. In his youth, Merciless was the leader of the Dragon Rebellion, until Hiccup the First, using the Dragon Jewel, made him leave the Archipelago and never return, or else his fate--to be killed by a boy named Hiccup--would come to pass. A thousand years later, he returns to the Archipelago and is killed by the cunning of Hiccup the Third.

The Purple Death/Horror

Main article: Purple Death

The Purple Death (also called The Purple Horror) is one of three Seadragonus Giganticus Maximus to appear in the first book of the How to Train Your Dragon book series. It is said to be larger than the Green Death, but is eventually killed by it.


Main article: Furious

A possible picture of the Dragon Furious from the UK cover of Book 8. However, Furious is said to be green in Book 8, and blue in Book 9, never red.


The Dragon Furious's hand roughly to scale from the US cover of Book 8. Note that its green color is a result of plant life growing on it.

Furious was Hiccup the Second's dragon, sometimes referred to as his "brother". After Hiccup was killed, he was captured and used by the Berserks as an executioner, and was turned bitter and evil over the years. He currently leads the Dragon Rebellion, whose goal is to exterminate the human race (Hiccup Horrendous Haddock III in particular).

The Wodensfang

Main article: Wodensfang

The Wodensfang


Possible art of the Wodesnfang on the cover of the UK verision of Book 9. However, the Wodensfang is not guarding Hiccup's sword, he is guarding the Crown, and he is brown, not blue.

It is revealed in How to Betray a Dragon's Hero that the Wodesnfang is a Seadragonus Giganticus Maximus. He was the dragon of Hiccup the First. He stole the Dragon Jewel and gave it to Hiccup I, stopping the first dragon rebellion. When Hiccup III came around, he gave Hiccup III the Crown in the Fire Pit. Later, he makes a deal with the Dragon Furious that he will betray whoever becomes King of the Wilderwest to the Rebellion.


Main article: Toothless
Tribe toothless3

A baby Toothless from the books.

In How to Betray a Dragon's Hero, it is revealed that the Toothless from the books is also a Seadragonus Giganticus Maximus. He is Hiccup the Third's dragon, a tiny, stuttering, toothless Common-or-Garden--so everyone thought. In time, Toothless will grow to the size of a mountain, possibly gain teeth, and then shrink again in his old age. He is the "Best Thing" of the King's Lost Things, and is currently in the possession of Alvin the Treacherous.


  • The Red Death was used to be categorized as a Seadragonus Giganticus Maximus; the movie counterpart of the Green Death until very recently, however, the 'queen of the dragons' is suddenly re-classified and is now a newly confirmed species of Stoker Class.


Dragon Species
Seen in the Books
Arsenic AdderwingBasic BrownBig Spotted GormlessBloody CrocoraptorBlubberwingBrainless Leg-RemoverBreathquencherBullingdozerBullrougherBullpuffBurrowing SlitherfangCentideleChickenpoxerCommon or GardenCuckoo DragonDarkbreatherDeadly NadderDeadly ShadowDevilish DervishDimbruiserDreamserpentDriller-DragonDrowsy-Tipped DragonmouseDoomfangEagleflyEight-Legged BattlegoreEight-Legged NadderElectricsquirmElectrictickyEmperor Beetleboog BolderbugExterminatorFire DragonFirestarterFlamehufferFlashfangFlutterfireFlying GatorGiant Bee-EaterGiant DeathwatchGloomerGlow-wormGolphinGoreblufferGorgenghastGreater PricklepineGrimlerGronckleHellteetherHogflyHorrorsHypnomunkLackwitLesser Blackbacked SeadragonLesser-Spotted SquirrelserpentLeviathorganLoafer DragonLong-Eared Caretaker DragonLong-Eared FlutterfireMarsh TigerMonster of the Amber-SlavelandsMonstrous NightmareMonstrous StrangulatorMood-DragonMurderous DragonNanodragonPlankenteeniePoison DarterPoisonous PifflewormPolar-SerpentPricklebogglePricklepinesPuff NadderPuggleRageblastsRaptortongueRavenhunterRazorwingRed-Hot ItchywormRed TigerReptoRhinobackRiproarersRocket RipperSabre-Tooth Driver DragonSand RattlerSandrazorSavagerScarerSeadragonus Giganticus MaximusSharkwormShortwing SquirrelserpentSidewinderSilver PhantomSkullionSky DragonSlitherhawkSlugblobSniffer DragonSnub-Nosed HellteetherSpecklehoundSquealerStealth DragonSticky StealerStickywormStinkdragonSwiftgliderThor's ThundererTiddly-Nip Tick-BothererToothless DaydreamTonguetwisterToxic NightshadeTwo-Headed GormatronUnderground Tail-HunterVampire DragonVampire SpydragonVenomous VorpentWater DragonWindwalkerWinterflesherWhite DragonWoden's NightmareWolf-Fang'X' DragonZebramount
Seen in the Franchise
BewilderbeastBoneknapperCatastrophic QuakenCavern CrasherChangewingDeadly NadderDeath SongEgg BiterFirewormFlightmareForeverwingGobsuckerGrapple GrounderGroncicleGronckleHackatooHideous ZipplebackHobblegruntHotburpleMoldruffleMonstrous NightmareMudrakerNight FuryNight TerrorRaincutterRazorwhipRed DeathRumblehornSand WraithScauldronScreaming DeathScuttleclawSeashockerShivertoothShockjawSkrillSliquifierSmothering SmokebreathSnafflefangSnaptrapperSnow WraithSpeed StingerStingerStormcutterSubmaripperSweet DeathSword StealerTerrible TerrorThornridgeThunderclawThunderdrumThunderpedeTide GliderTimberjackTyphoomerangWhispering DeathWindstrikerWoolly HowlUnknown Dragons

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