Do you accept the lore-destroying abomination that is ESO as canon to TES lore? (If you do, you're -blam!-ing retarded.)
Discuss.
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Well seeing as ESO is 1000 years before the events of Skyrim and is in the 2nd Era when the events of all the other games (Arena, Oblivion, Morrowind, Daggerfall) happened in the 3rd Era and Skyrim happening in the 4th Era. The events of ESO are the prequels to all of those games. So yes, it's canon, it just breaks stuff like Star Wars Episode One did.