First time noticing this, but Umbacano is in Morrowind. (He's in Yassu Mine, a glass mine inside the Ghostfence.) https://en.uesp.net/wiki/Oblivion:Umbacano No special dialogue though. : r/Morrowind
The Elder Scrolls IV: Oblivion - Wikipedia
The Elder Scrolls IV: Oblivion - Wikipedia
The Elder Scrolls IV: Oblivion - Wikipedia
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The Elder Scrolls IV: Oblivion® Game of the Year Edition Deluxe on Steam
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The Elder Scrolls IV: Oblivion/Map — StrategyWiki | Strategy guide and game reference wiki