My favorite weapon is [i]Chillrend[/i].
Apart from having the most badass sounding name ever, it looks visually awesome, and has a nice frost effect too.
Always my preferred sword of choice in both games.
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Oblivion: [url=http://morroblivion.com/files/resize/BioWire@Steam1/images/2013-07-03_00003-1366x768.jpg]Dragonsword Of Lainlyn[/url]. Skyrim: Glass Sword. Clean design. Good shade of green that contrasts surprisingly well with the gold hilt.