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Dark Age of Camelot.
Based on real lore. You get to roleplay as a viking, celt, or briton. It had a hardcore free for all player verse player server that had no rules, you could kill anyone, anywhere. However it turned retarded like all MMO's do with constant "expansions" that try to milk every last penny they can get from the playerbase with retarded new races and overpowered items/abilities.
It used to be great though. I learned a lot about viking/celtic/arthurian lore without even knowing it.