What is the best sword in oblivion

The top 3 best swords in the video game The Elder Scrolls IV: Oblivion are:
1. Chillrend
2. Goldbrand
3. Umbra

In terms of raw damage, Umbra is, which you can get during the Clavicus Vile quest. Second is Goldbrand, your reward for the Boethia quest.
Umbra may have the most base damage, but Chillrend is the best because if you are level 25+ it attacks with 20 points of frost along with the fact that it weakens the enemy to frost by 35%, making the damage 27 points instead. In addition to that it is a short sword, allowing the user to attack far quicklier than the Umbra sword.

What about duskfang and dawnfang?

If you are a high level and have The Shivering Isles expansion the sword you receive from the dead Orc at the end of the quest for Xedilian may be the best. It is significantly higher quality/durability and normal weapon damage than Umbra and somewhat more than a Daedric sword; it is equaivalent or slightly higher quality/durability and normal weapon damage than a Perfect Madness sword. It also has 40 fire damage during the day, and 40 frost damage at night, and 80 uses for each. The best part about it is when it transforms from night to day or vise versa, it recharges its magical energies, so you get 80 free charged uses every 12 hours. In addition to that, once you use it to kill 12 people or creature in a 12 hour period, the sword will recharge itself automatically, AND it will now have an absorb health attribute in addition to a more powerful fire-or-frost attribute. The only problem with this sword is that it is leveled, so all magic effects, uses, quality/durability, and normal weapon damage are relative to your own level; however, once you are level 25 or higher it is superior to all other one-handed blades (and probably all blades, the best Claymore being Shadowrend) in the game by far.