Little Sister
"Little Sister" is the name given to a harvest bear that was the companion of Toltrau. The actual name has been lost, having been translated to different languages out of the Lily Civilization and back to Yuriba by word of mouth, but legend holds that Toltrau raised Little Sister from a cub, and was absolutely inseparable afterward. What little oral lore there remains mentions that Little Sister's grumpiness was legendary even unto itself, requiring a jar of honey and at least two fish. Hugs were also known to work as well, although this seemed to only ever work for Toltrau.
One of the stories that is commonly told involves a raid by the Lilians, as they were hunting down the Toltrauans for sacrifices. During one such raid, Toltrau happened to be ill, possibly a bad case of stomach flu, and was unable to move herself to safety, and thus directed her peoples defense and escape from a litter. The Toltrauans carrying her litter were struck down by arrows during this time, and Little Sister charged from Toltrau's side, and single-handedly killed several raiders, drove off the rest, and then pulled both litter and litter-bearers to safety. In her honor, several statues were shaped from stone, and placed prominently as warnings to the raiding Lilians.
It is said that these statues still exist, somewhere, and that if you should come across one, appeasing her grumpiness will reward you with her blessing.
Constellation
The Yuriban constellation of Little Sister was once simply considered an unknown or unremarkable Harvest Bear, the stars not very bright or easy to see. After the events which led to the rise of the legend of Little Sister, local folkstory states that the stars grew brighter, gaining strength as Little Sister’s renown grew.