The power to
hold dominion in the Afterlife. Variation of Personal Domain.
The user has authority and duty in the
Afterlife, a place where the souls of the all recently departed go. Exact conditions of the dead vary depending of the pantheon, but every soul comes there and while some may be punished and others rewarded.
Users are able to command the dead, and have powers related to life, and death, souls in general as well as power to bind and restrict (dead are expected to stay there after all). Some may have duties and powers related to Death and bringing the souls where they belong.
Hades/Pluto (Greco-Roman Mythology), Ruler of the Underworld.
Davy Jones (Pirates of the Caribbean) had power over both the seas as well as Davy Jones' Locker, a purgatory afterlife where those lost at sea or taken by the Kraken dwell.
Papa Legba (American Horror Story: Coven) is the ruler of the many Hells the coven encounters
La Muerte (The Book of Life), Ruler of the Land of the Remembered
Xibalba (The Book of Life), Ruler of the Land of the Forgotten
Hades (Hercules), Lord of the Dead and Ruler of the Underworld
Ms. Slither (Grim Adventures of Billy and Mandy) is the oppressive ruler of the Detention Dimension, a hellish-realm where bad children are sent to detention for all of eternity.
Lucifer Morningstar (DC Comics/Vertigo Comics), former ruler of Hell
King Minos (Dante's Inferno), judge of the damned and duke of Limbo.
Jubileus, the Creator (Bayonetta), Goddess of Light, and the creator and ruler of Paradiso and the angels that inhabit it.
Queen Sheba (Bayonetta), ruler of Inferno
Michael (Valkyrie Crusade)
Lucifer (Valkyrie Crusade)
Crowley (Supernatural) is the King of Hell
Hades (Once Upon a Time) was ruler of the Underworld, a limbo-like afterlife where those with unfinished business dwelled...
...a title passed onto King Arthur.
Death (Adventure Time), ruler of the Land of the Dead.
Hunson Abadeer (Adventure Time), ruler of the Nightosphere.