Baba Lysaga was an insane and powerful hag. She was completely convinced that she's Strahd Von Zarovich's mother. When Strahd was baby, his real mother, Ravenovia Van Roeyen, hired Lysaga, who appeared as a human woman, to be his nursemaid and babysitter. Lysaga also helped raise Strahd's younger brother, Sturm. However, Lysaga became unpleasantly attached to Strahd in particular, so much so that Ravenovia fired Lysaga. Lysaga continued to follow the Von Zarovich family after they moved, and followed Strahd all the way to the valley of Barovia. Strahd hates her and avoids her as much as possible.
Lysaga had a maze in the swamp of Berez, where she sought Dina Coventry in a prolonged game of hide and seek. With Dina's help, she was killed by Team TRASH (pandas). Dragomir split her in half and took her heart. The heart later reconstituted in the Weathermay Mausoleum in Mordentshire, where she was killed once again.