Kardia

Kardia is an old witch who lives in the Underground Pass that has lost her cat. She is the only person that knows how to destroy Iban, and the doll used to do so is inside her house. She is also immensely powerful, as she is the one who created Iban in the first place.

After completion of the Swept Away quest, she will reward broomstick-owners with 14,979 Magic Experience points if they talk to her with their broom. A level of 93 Magic or above is required, although players can use stat-boosters (like a Magic potion) to reach the level requirement. The fastest way to reach Kardia for the experience reward is through the Abyss, Death Altar and the tunnel that leads into Underground Pass, if the player has completed Mourning's Ends Part II. Maggie, possessing knowledge of Kardia and her whereabouts along with other powerful Gielinor witches, tells the broomstick-owners that Kardia might "not talk to you" but will enchant your broom if you are sufficiently skilled.

Trivia

 * Kardia is the Greek word for "heart" which may be because that she lies in the middle (the heart) of the underground pass.