The Ritual Stone (Skyrim)

Effects
This stone allows the Dragonborn to re-animate any nearby corpses to fight for them once a day.

The ability granted by the stone is not actually a simple resurrection spell that reanimates a single dead body, but rather a large resurrection field that expands out from around the player, resurrecting all corpses in its radius for 60 seconds.

Once the time has elapsed, the re-animated will behave similar to a Dead Thrall and fall to the ground.

Location
The Ritual Stone is found east of Whiterun, between Whiterun and the Valtheim Towers (south of the river), possibly guarded by a hostile necromancer and two Skeletons.

Armor and item duplication exploit
An exploit to duplicate almost all items and armor on almost any corpse is available by using The Ritual Stone. The following steps explain how this can be achieved:
 * 1) Remove all items from a corpse.
 * 2) Cast the Ritual Stone power.
 * 3) Once the corpse is reanimated either walk into to a different zone or fast travel to a new location.
 * 4) Upon arrival at the new location the reanimated corpse will have all items/apparel that they originally had in their inventory.
 * 5) Kill the reanimated and retrieve the duplicated items from the corpse.

This exploit is confirmed to also work on Unique Armors such as General Tullius' Armor. Furthermore, weapons do not seem to respawn on corpses when transitioning between zones.

This exploit is also possible via the Dead Thrall spell.

Trivia

 * Reanimated Corpses can fast travel with their summoner, but will usually die immediately upon arrival.
 * Let it be noted that the Reanimated Corpses last for 3 minutes duration.
 * It has been said that upon arrival to the Ritual Stone, the Dragonborn will face a Necromancer and a Skeleton adjusted to one's difficulty, and will be readily aided by an unknown and unseen ally (arrows that have no source and sometimes even sword blows from out of thin air). Witnesses have taken to referring to this phenomenon as the "Bandit Ghost of the Ritual Stone," speculating that the ally may be the lingering spirit of one of the bandit archers who met their end at the hands of the Trolls in Graywinter Watch directly beneath the Ritual Stone. The Vernaccus and Bourlor (Archer Skill Book) and the deceased Bandit Archers found within the cave does seem to corroborate and/or foreshadow the claims of these phantom arrows, but so far any concrete explanation of these "phantom arrows" remains unknown.