The Element Encyclopedia of Witchcraft: The Complete A-Z for the Entire Magical World - Judika Illes 2005
Muir Larteach, the Sea Hag, lives in an underwater realm. When she rises to the surface, this one-eyed bald hag with the bluish-gray face raises storms.
Muir Larteach is a trickster. She emerges from the water in the guise of a pathetic little old woman and hammers on doors of nearby homes begging for shelter. She looks harmless and so is ushered in. Once inside, however, she swells up like Alice in Wonderland in her growth phase and causes tremendous damage.
On the positive side, Muir Larteach carries a pot of balm that can heal any wound or illness. Moreover, by poking her finger in their mouth, she revives the dead.