Keening can be found in Odrosal. The Odrosal Dwemer Training Academy only has three creatures in it: a Flame Atronach, a Golden Saint and Dagoth Odros, an Ash Vampire. The short route to Keening is to go through the first set of doors to your right (level 20 lock) and climb the ladder to the tower that you'll find against the back wall. But the area isn't that large, the creatures aren't that tough and there are a ton of Dwarven weapons and armor scattered about.
Dagoth Odros (30th level Ash Vampire): 440 HP/360 MP, no weapons, no armor, 90% combat, 90% magic, 100% stealth
- Attack Damage: 3-34/1-100/2-20 (chop/slash/thrust)
- Heartfire Amulet (Cast When Used):
- Fortify Agility 10-20 for 30 seconds
- Fortify Speed 10-20 for 30 seconds
- Fortify Fatigue 20-40 for 30 seconds
- Fortify Unarmored 10-20 for 30 seconds
- Chameleon 20% for 30 seconds
- Spells:
- Hand of Odros (touch)
- Damage Fatigue 60 points for 1 second
- Absorb Agility 3-6 points per second for 120 seconds
- Burden 30-40 for 60 seconds
- Wrath of Odros (ranged)
- Damage Fatigue 60 points for 1 second
- Absorb Agility 3 points per second for 120 seconds
- Burden 20-30 for 50 seconds
And the object of all of this is:
Keening (Dwarven Shortsword, 9-15/9-15/9-18), constant effect:
- Fortify Magicka 50
- Fortify Health 30
- Fortify Attack 30
- Fortify Agility 20
- Fortify Speed 20