Masters of the Unseen Tower
Baba Yaga's Hut
Baba Yaga is a name that most wizards hear at some point in their studies. Largely thought to be a myth or a legend, some claim to have actually met the witch.
Legend has it that she travels the planes in a hut which can rise up on chicken legs and move from place to place.
It is most likely larger on the inside to accomodate the witch's lavish lifestyle.
Most tales of Baba Yaga detail her quest to conquer death, not through the more usual methods of becoming a lich, or cloning herself into a younger body when necessary, but by capturing Death himself and extracting a promise never to claim her.