Any and all knowledge or insight into the ancient and/or medieval myths of Estonian tribes would be much appreciated. I am aware of the supreme god Taara, sacred groves, sacrifices, and other subjects which appeared in the medieval (12/13th century) chronicles. I am trying to reconstruct this mythology to feature in a novel which I am currently in the early stages of compiling. Any other gods, spirits, rituals, traditions, creatures, or folk tales from before the Christian invasion of Estonia would help me tremendously.
NOTE: I want to try and steer clear of the reconstructed mythology such as in the Kalevipoeg due to my story's setting in the 13th century. I will also be borrowing myths from adjacent Lithuanian, Latvian, and Finnish (maybe Slavic) lands, but I would like to try and focus on Estonian mythology.