Idk about glitches but I really enjoyed the Thieves Guild and Dark Brotherhood quest lines in Oblivion. They were way better than the ones in Skyrim. I was disappointed when I realized they weren't in ESO.
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There is an expansion coming dedicated to the Thieves Guild
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They are actually adding atleast tdb into eso. Idk when.
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I heard that as well. I think it's not until Q1 or Q2 of next year
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I also heard they were going to add houses.