This quest is probably the one which gets most gamers stuck. You need to rescue the Domovoi in the Monastery by getting the Rehydration Fluid from Dr. Cranium, available on the fourth day if you give him the formula and a flask of grue goo. You also need to stay up until midnight at the inn to find the Domovoi sitting in the main hall of the inn. If you talk to him twice, once after you've rescued the Domovoi he'll tell you the story of Tanya and allow you to take the doll from the center cabinet that once belonged to her. The problem is if you don't do this in the first ten days or so you may never get the chance to meet the Domovoi.
In addition, all classes need to rescue the gypsy Davy and talk to the gypsies to learn about the Destiny Spell and how Erana's staff will allow one life to be sacrificed for another.
Wizards[edit]
Characters who are wizards in class can meet the faeries, who will conjure a fountain outside Erana's Garden at night. The wizards need to return a second time to see and use a staff illusion. The faeries want you to bring them Erana's staff, so they'll teach you the Ritual of Release spell which you'll automatically use while saving Tanya. After she's saved, this side quest continues further.