More:The Elder Scrolls 4: Oblivion: Combat

From GameWinners

Contents 1 Defeating Dread Zombies 2 Defeating Umbra 3 Undead

Defeating Dread Zombies

To easily kill Dread Zombies, use a weapon enchanted with some sort of Fire attack, such as the Longsword Of The Blaze or the Fire Blade. They will easily die within three hits.

Defeating Umbra

Go to Rindir's Staffs and buy the staff called "Apotheosis". Do not use it. Go to Old Bridge and make sure you have a bow and arrow. Go to the ruin that starts with a "V". Kill the minor creatures (mostly rats) and you will reach a campfire. The person in the room is Umbra. Do not attack yet. First, look at the broken pillar. You can get on top of it by jumping from the nearby table. Once on top, fire an arrow at her head. She will attack. Do not fall off or she will kill you. Fire two more arrows in her head. Note: She runs around very quickly, so you must aim carefully. Then, take out Apotheosis. Blast her a few times to defeat her. You will get ebony armor and a very good sword. It will help you if you are a vampire and are at least level 8.
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Note: You may want to do this at level 7 or higher and have a high Strength attribute. Pause game play and go to the options menu. Go to "Game Play" and change the difficulty to very easy by setting the meter to the lowest value. Then go to Vindasel, which is west of the old bridge. It is south of the Imperial City. Find a campfire inside Vindasel. Umbra will not attack you on sight. Take out your best weapon and slash away until she is dead. If you manage to kill her, you will get an extremely strong sword called Umbra and some very good armor. Note: The armor makes you very slow when equipped.

Undead

To avoid trouble with ghosts, ghouls or other similar things that appear when you sleep, drop a silver weapon in every inn you sleep in often. Pick it up when you get attaked by the monster, then drop it when finished. Note: This is especially useful if you get expelled from the Dark Brotherhood.