One day, K'yuu was hunting in the forest when he saw a group of men from another tribe stealing from his people. K'yuu was angry, and he used the spirit stick to turn the men into stone. However, this was a selfish use of the spirit stick, and the curse was unleashed.
The curse caused K'yuu to become sick. He grew weaker and weaker, and eventually he died. His people were very sad, and they buried him with the spirit stick. They also made a law that no one would ever be allowed to use the spirit stick again.
The curse of the spirit stick is a reminder that power must be used wisely. If it is not, there can be terrible consequences.