Grunhilda

Grunhilda was a Pixie who served a Sidhe elder and Princess Elena (while disguised as a human). A squat and toadlike old woman in her human form, Grunhilda's true form was repulsive to behold, with raw, red skin covered in hideous black warts.

Biography
A short time after the birth of Lord Godwyn's daughter, Princess Elena, the elder came and cast a spell on her. He created a Sidhe inside her who would completely possess her when she married Arthur Pendragon. He had Grunhilda become her nurse and sprinkle Sidhe dust on her every night as she slept. When she was 20, Uther Pendragon and Godwyn, who were old friends, arranged a marriage between her and Arthur. Arthur's servant, Merlin discovered the plot. Grunhilda informed the elder of this and he tried to kill Merlin in his sleep, however, he was killed by Merlin's Sidhe staff. Gaius prepared a tonic to get the Sidhe out of Elena. Because Elena couldn't drink the tonic with Grunhilda in her room, Merlin and Gaius decided to set a trap. Gaius asked Grunhilda go to cellar with him, so they could have some private time. Grunhilda was attrackded to Gaius, so she said yes. Gaius escaped from the vault leaving Grunhilda there. Merlin then locked her in with magic and she licked Gaius with her long tongue. Gaius told Merlin to never speak of this again. As Gaius and Merlin went to Elena's room, Grunhilda was able to blow off the gate using magic and chase them. As Gaius gave it to Elena, Merlin held Grunhilda off, he then killed her and the Sidhe inside Elena. Elena and Arthur then agreed they didn't love each other and cancelled the marriage. (The Changeling).