It is one of three possible powers gained from the quest "Black Book: Untold Legends".
"Summons a Dremora butler for 15 seconds to carry your excess items."
When activated, a Dremora Butler appears and offers to carry any items for the Dragonborn much like a follower. His carry weight is capped at 148.
- Can be used to save items if over-encumbered and far away from any locations where items can be sold or stored.
- Can be used to "smuggle" items into areas where the Dragonborn's items are restricted or taken, such as after being arrested, Cidhna Mine or the Thalmor Embassy.