Skyrim:Reanimate

Reanimate revives the corpse of a targeted NPC. The corpse comes back to life and fights for the caster for the duration of the spell. The advantage of reanimated enemies is that there is a variety of enemies to reanimate as opposed to conjured creatures who have to be unlocked or bought individually.

Enchanting
The following items use this effect, but cannot be disenchanted:
Staff of Dread Zombies
Staff of Reanimation
Staff of Revenants
Staff of Zombies

Spells
The following spells use the Reanimate group of effects. Following each spell is the specific variant of the effect that it uses:
Raise Zombie: Reanimate ( ;  )
Reanimate Corpse: Reanimate ( ;  )
With the Dark Souls perk, instead uses: Dark Souls Reanimate Corpse ( ;  )
Revenant: Reanimate ( ;  )
Dread Zombie:
Reanimate ( ;  )
Reanimate ( ;  )
Dead Thrall: Reanimate Thrall ( ;  )
thumb|right|A zombie with the Ahzidal's Necromancy effect
Ahzidal's Necromancy
The unique Ahzidal's Necromancy enchantment available from Ahzidal's Ring of Necromancy  changes the effects of your Reanimate spells when equipped. Reanimated corpses will be covered in frost and will explode for 50 points of Frost Damage the first time they take damage. This kills the zombie in the process, however.

Notes
The average thrall groans while they are reanimated. Some NPCs with unique voice acting sets (such as Galmar Stone-Fist) do not groan at all in undead form.
Anything that is reanimated turns into dust when killed or when the spell expires and cannot be reanimated a second time. The exceptions are creatures reanimated by Dead Thrall, The Ritual Stone power, or with staves, which leave normal corpses that can be reanimated again and again.
The level cap of a reanimated undead target can be raised by 25% with Restoration perk Necromage.
Reanimation spells do not work on giants (though the Ritual Stone's power or the Soul Tear  shout will reanimate them). Dwarven sentinels do not appear to be able to be reanimated by any means.  
Decapitated enemies cannot be reanimated.
Reanimated necromancers will not reanimate fallen enemies.
NPCs with unique death quotes, when brought back by Dead Thrall, will sometimes repeat them when they die again&mdash;for instance, Amaund Motierre will repeat "But... we had a deal!"
Conjuration XP gained by casting this spell is only attributed when the dead body is completely reanimated, and only when you and your thrall enter combat.
Frequently, when you reanimate an enemy that uses a weapon such as a human or a Falmer, they will neglect to use said weapon in combat. To fix this, take the weapon from their dead body and place it back on them before reanimating. It seems that thralls will only use weapons that are nearby, and taking and replacing the weapon ensures that it is on their body rather than on the ground.  
You cannot access a reanimated NPC's inventory.
With the Twin Souls perk, two NPCs may be reanimated at once.
Transforming into a Vampire Lord  or Werewolf will dispel any thralls.
When you fast travel to a major city, your thrall is left behind at the city stables to be picked up later.
Thralls may get lost. To remove the "Reanimate Thrall" active effect, get arrested, transform into a werewolf or vampire lord, hunt down and kill the lost Thrall, or use console commands. 
Dead thralls cannot be healed without the Necromantic Healing or Heal Undead spells. Non-vampire dead thralls do not regenerate health naturally and are not affected by Fortify Healing Rate enchantments. But they use and benefit from healing potions, food and self-healing spells (if they knew any while being alive).  

Bugs
 
 
 To fix this, go back inside and find your thrall, open the console, and target your thrall&mdash;you should see their RefID. Do not click on anything else. Close the console, go outside, and open the console again to issue the command  . Your thrall should now stand next to you. If you have more than one thrall, copy down all their RefIDs on a notepad, then use   RefID  . 
 
 
This can be fixed by using all three words of Unrelenting Force on the zombie or thrall. Doing so will turn them into a ragdoll, which should reset their behavior once they get up.