Outcast Tribe

The Outcast Tribe (formerly known as the Treacherous Tribe) is a Viking tribe first introduced in Book 2, How to Be a Pirate that were formed from Vikings who were so vicious, so terrible and sneaking and burglarous, that they had been cast out of regular Viking society, and formed an extraordinarily ferocious Tribe of their own. The tribe was founded by Thugheart, the traitorous son of the last king of the Barbaric Archipelago after he was banished to the pair of islands that would later become the Outcast Lands, where he founded the Tribe and became the tribe's first chief.

History
Their founder is the Royal Chief, Thugheart. Thugheart was the treacherous and barbaric eldest son of Grimbeard the Ghastly, who, along with his remaining followers, was banished by his father to a pair of islands someway to the south of the Isle of Berk for his treachery that lead to the downfall of the Kingdom of the Wilderwest and the death of his younger brother, Hiccup Horrendous Haddock the Second. There Thugheart united all the inhabitants of the islands and formed the Treacherous Tribe, and became its first Chief, eventually marrying Sychofanta of the Sharp Knife and Slippering Way. The Treacherous Family are directly descended from Thugheart, which also distantly relates the Treacherous's too the Horrendous Haddock Chieftain Clan of the Hairy Hooligan Tribe, which were descended from Thugheart's brother, Chucklehead and even more distantly to the Bog-Burglar Chieftain Clan, who are descended from the family of Hiccup Horrendous Haddock the First, the Horrendous Haddock's founder. Though the descendants of Thugheart's original followers can be found among the tribe, most of the members of the Outcast Tribe, are derived from other Viking Tribes who were exiled from their tribes of origin for crimes so heinous that even the Vikings could not ignore them, which included treachery, murder and dishonouring the dead, hence the name 'Outcast'. Despite this, the Outcasts are close allies of other vicious and archipelago-hated/feared tribes such as the Lava-Lout, Berserk, Visithug, Uglithug, Murderous and Rudeboy Tribes and traded with them regally.

Customs

 * Cannibalism: Outcasts are savage and cannibalistic Vikings. They are always at constant war with the other tribes and feared by many, due to their acts of enslaving rival tribes and eating the rival tribe's chief and his potential heirs. Ingesting the flesh of a chieftain and his descendant is considered a sign of honour.
 * Personal Adornment: Most Outcasts adorn themselves with fantastic jewellery, gorgeous clothing, golden ornaments and very stylized helmets as well as many also boasting handsome appearances and attractive red hair. However, due to the tribes constant warfare, many tribe members, man and female, have scars carved into their faces, slit noses, disfiguring dark red tattoos, said to be made out of the blood of their enemies, and even sometimes missing body-parts like noses or ears. Many also file their teeth to sharp little points, like the teeth of a shark.
 * Warriors of Both Gender: Unlike several other tribes, the Outcasts consider male and females equals and Outcasts raiders can consist of just as many women as men. Women are also treated with just as much respect as men and both boys and girls are trained in the Outcast version of the Pirate Training Program.
 * Outcastese: Despite being considered Vikings, which speak Norse, Outcasts have developed their own language called "Outcastese" that "sounds very much like the barking of a dog."
 * Hair: As with the Hairy Hooligan Tribe, hair - especially facial hair on men - appear to be a symbol of status and masculinity, and is very important to the Tribe. Men and women often allow their hair to grow wild and women rarely, if ever, comb their hair, allowing it to grow greasy and entangled with the salt, sand, shells and other contents of the sea. In How to Speak Dragonese, Alvin the Treacherous describes returning to the Outcasts after having all his hair burned off by the Monstrous Strangulator's stomach acid. Despite being the chief, he is shunned and outcast himself from the Outcasts.
 * Deities: Unlike the rest of the Archipelago, the Outcasts worship a set of gods and demigods separate from the figures of Norse Mythology, who they often invoke in their oaths.
 * The Vallas: The Vallas, also known as the Four Vengeful Ones are four deities that act as the Supreme deities of the Outcast religion. They are the gods of vengeance, with appearances depicting a shark, a bear, a venomous serpent and a vulture. The Vallas consist of Thurak (the shark), Gorlog (the bear), Hergel (the vulture) and Apophertres (the serpent). Each Vallas represents one of the four darkest parts of the soul. Thurak represents pain, Gorlog stands for rage, Hergel holds sway over dishonor and Apophertres lords over treachery and deceit. Though all are have an important role in the Outcast's religion, Apophertres, who commands the very thing that urged the Outcasts to commit the crimes that lead to their banishment is seen as the mistress of all four. Each god has a spire of sea rock that lies within the waters of Treachery Cove, as well as a shrine of their respective sea stack. A Vallasvow can be sworn to the Vallas, with the person taking the Vallasvow against someone, and swearing their intent to kill that person and all their loved ones. The downside is that if you fail a Vallasvow, you go to the deepest reaches of Hall of Hell and the Vallas will wreak vengeance upon your family instead. A Vallasvow, however, by rights, can only be taken against treachery or murder.
 * Bungall: A minor deity, generally referred to as the god of acting in an embarrassing manner. He is known to have a braided beard, which is sometimes referenced on the rare occasion that his name is invoked.
 * Gorlog: Unlike many gods, Gorlog has no specialized skills. Many of his features, such as his beard, teeth, breath, and claws, are often invoked as exclamations of shock.
 * Hulde: The goddess of the dead. Certain charms are believed to be able to protect the wearer from her.
 * Loki: A second rank god. He is considered to be The Liar.
 * Orlog: A minor deity, said to be the lesser known brother of Gorlog. He is typically only invoked in moments of great stress or surprise, often in conjunction with Gorlog.
 * Ullr: A second rank god. He is considered to be The Hunter.
 * Tharon: The god of Thunder. His weapon of choice is a hammer.
 * Thalga: The goddess of sailors and travelers.

Book Tribe Members

 * Thugheart (Founding Chief; deceased)
 * Sychofanta (Founding Chieftess; presumed deceased)
 * Algarick Ogglebert (Former Chief; son of Thugheart; presumed deceased)
 * Excellinor the Witch (Former Chieftess; deceased)
 * Alvin the Treacherous (Former Chief; son of Algarick Ogglebert; deceased)
 * Curly Horns (true name unknown) (warrior)
 * Fishlegs No-Name (legitimately; son of Alvin the Treacherous; rightful chief)

How To Be A Pirate
Toothless suspects Alvin the Poor-but-Honest-Farmer is an Outcast. Later, as the Hairy Hooligans are returning home from their quest to the dreaded Isle of the near-blind, near-deaf Skullions with Grimbeard's false treasure, they are caught by a ship packed to the brim with Outcasts, who silently board THE LUCKY THIRTEEN (the ship the Berkians were using) and quickly take the Hooligans by surprise and hold each and every Hooligan at the knife point, where Alvin revealed his true identity to the Hooligans as His Most Mighty Murderousness Alvin the Treacherous, Great High Chieftain of the Outcast Tribe. At their chief's order, the Outcasts chain the rest of the tribe, and prepare to kill Stoick and Hiccup, when Toothless distracts Alvin and his soldiers for a second, allowing the Hooligans to take their captors by surprise, free the Hooligans already bound for slavery, and a battle erupts. However a huge fire spreads across the ship after a torch falls into a barrel of black current wine and sets it alight and both tribes escape onto THE HAMMERHEAD (except Alvin, Toothless, Hiccup and Fishlegs) and resume the battle. Later, when Hiccup, Fishlegs, and Toothless return to the Isle of Berk from Grimbeard the Ghastly's hidden aquatic treasure cavern, during which Alvin was swallowed whole by a Monstrous Strangulator and presumed dead, Stoick explains they dropped the Outcasts back at the Outcast lands. The cannibals swore revenge on the Hooligans, but for the time being left in reluctant peace.

How to Speak Dragonese
Alvin mentions that when he returned to the Outcast Lands, they refused to have him as their Royal Chief, because the poison in the Monstrous Strangulator destroyed Alvin's hair, a bald Viking is something against their taboos. He was exiled and made an Outcast of the Outcast Tribe; an Outcast. Since Alvin's maternal grandfather was a Roman and since Alvin's mother, Excellinor the Witch, had taught Alvin Latin, the Language of the Romans, Alvin became the Thin Prefect of Rome, the arch-enemies of the Barbaric Archipelago.

How to Twist a Dragon's Tale
The Outcasts, along with their allies, the Lava-Louts and Rudeboys, were mentioned to be the only tribes that refused/were forbidden to attend 'the Thing' meeting between the Viking Tribes.

How to Break a Dragon's Heart
It is revealed by Excellinor the Witch, that when Grimbeard's rebellious and traitorous son, Thugheart, was exiled for tricking his father into killing another of his sons, Hiccup II, was banished with his remaining followers far to the lands on south where all the other exiles, rebels and mutineers were sent to, he became their leader and started the Outcast Tribe. Since Alvin is an Outcast, and Hiccup is a Hooligan, (The Chieftain Hooligan Clan are descended from another of Grimbeard's sons, Chucklehead) this means that both Hiccup and Alvin are distant relatives.

How to Steal a Dragon's Sword
Though they were not officially invited to the tradition tournament at Flashburn's School of Swordfighting. By that time, thanks to Excellinor's powers of persuasions, the Outcasts had made Alvin their chief again, despite his hairlessness. As Excellinor told the Viking Chieftains her lying tale of why the School of Swordfighting, the Chieftains did not notice men and women creeping in at the door, dropping down from the windows, leaking into the room like rats. People with slit noses, not enough noses and ears and teeth that had been filed into points. People dressed in long, black cloaks and hoods with every assortment of weaponry imaginable. People who made sounds like the soft barking and growling of dogs. Outcasts. As you do when you smell a rat, the Vikings drew their swords. It was also mentioned that several Outcasts had taken to creeping on all fours like their mistress. Despite the Vikings protests, they were overrated by Excellinor's claims that her "chosen people" had every right to participate, as they once again recognised her son Alvin, the grandson of Thugheart the Treacherous as their chieftain. Several of the Outcasts were mentioned to whimper as a nasty note entered Excellinor's voice. The Outcasts therefore participate with the other tribes in Flashburn's School of Swordfighting Tournament. After, once again thanks to Excellinor's manipulations, Alvin is crowned king-in-waiting-of-the-Wilderwest, the Outcasts, once the most hated beings in the Archipelago, become it's masters, leading the Viking Ships out of the bay of Angry Mountain and back to their various islands to make preparations for the now-all-out Dragon Rebellion.

How to Betray a Dragon's Hero
Due to Alvin being their chief, a good number of the Outcasts joined the Alvinsmen and took up base in the Alvinsmen's Sea Cave headquarters on Murderous Island.

How to Fight a Dragon's Fury
The Outcasts, alongside all of the Alvinsmen and Dragonmarkers, were present on the Island of Tomorrow, where they, albeit reluctantly, supported Alvin's claim to kingship. However, after Hiccup, who had previously been believed dead, revealed himself to be alive, the Alvinsmen, Outcasts included, began realizing that Hiccup was perhaps a better candidate than their chief, as all present knew that should Alvin be crowned king, he would use the secret of the Dragon Jewel to wipe out the Dragons forever and were all in all pleased when Hiccup was chosen above Alvin. Later on, the Outcasts and Alvinsmen, lead by Madguts the Murderous, fought on dragonback against the draconic forces of the Dragon Rebellion and during the battle, Alvin is killed by the Dragon Guardians of Tomorrow and Excellinor is killed by Furious. Though it is unknown who took Alvin's title as chieftain, Fishleg No-Name (Alvin's son) is technically the next in line.

Trivia

 * The Outcasts are the only Tribe from the Barbaric Archipelago to speak something besides Norse.