In the world of The Elder Scrolls, there are a great many Guilds, few of which appear in Skyrim. In addition to the biggest two, the Fighters and Mages Guilds, there are a plethora of minor ones that have never appeared in the games, but hopefully some will make an appearance in future titles such as Elder Scrolls 6. Their likelihood is questionable, but they have potential if done right.
In Skyrim, there are four main NPC factions that players can join; the Companions, the College of Winterhold, the Dark Brotherhood, and the Thieves Guild. Each one has their own questline and cast of characters to interact with. There's also the Bard's College, but it's a very minor aspect of the game, and its quests are easy to miss in Skyrim. In other Elder Scrolls games such as Oblivion, the factions are much more organized, and have multiple branches scattered throughout the map. They're fun ways to find trainers, good gear, and followers, and can help with roleplay and immersion by letting players pick which factions their character would join, and that match their playstyle.
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Most of the minor Guilds in the Elder Scrolls series teach trades, and have little to do with combat, so it makes sense that they've never been shown. The Guilds Act of 2E 321, signed by Potentate Versidue-Shaie, officially established the Tinkers, Cobblers, Prostitutes, Scribes, Architects, Brewers, Vintners, Weavers, Ratcatchers, Furriers, Cooks, Astrologers, Healers, Tailors, Minstrels, and Barristers Guilds, but not the Fighters and Mages Guilds that some of the Elder Scrolls' protagonists can join. The full details and history of the minor Guilds is largely unknown, but they presumably
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