Dremora (Skyrim)

 are a race of Daedra in The Elder Scrolls V: Skyrim. They can be summoned using Conjuration magic or Sanguine's Rose. Found mostly during Daedric quests and the Conjuration Ritual Spell. Their hearts -- which are the key ingredient in all Daedric Armor and weapon sets -- are some of the rarest items in Skyrim.

The spell, Summon Unbound Dremora, spawns a Dremora where the caster is pointing; however, the Dragonborn should beware as the Dremora is literally unbound: it will immediately become hostile and attack regardless of any attempted interactions or claims of being its master.

When summoned via the Sanguine Rose, the dremora will be considered "bound" and fight for the Dragonborn, like any other conjured Familiar or Atronach. Dremora summoned in this way, again like summoned atronachs, will not drop anything upon defeat, be it by an enemy or the Dragonborn personally.

Finally, it is possible that use of the Wabbajack will turn the target into a hostile Dremora.

Trivia

 * Although they mainly use Daedric Armor, you can´t loot it from their bodies.
 * It is interesting to note that most Dremora wield fire enchanted weapons, mostly a Deadric Greatsword, and Dremora that prefer spells over weapons are highly skilled in the destruction school, namely fire.
 * All Dremora, when summoned via the Sanguine Rose, have a Daedric Greatsword enchanted with fire damage.