Could you explain the significance and power of Sai Baba's Udi as described in the texts?

Certainly. The Udi from Sai Baba is described as supremely auspicious and a tool for both spiritual welfare and the fulfillment of worldly interests. Chapter 33 explains that stories of its benefits are countless. For example, it was sought to relieve the severe pain of a scorpion sting. The text highlights that faith is paramount; in one instance, when actual Udi couldn't be found, the ash from incense sticks below Baba's picture was used with prayer and faith, and it immediately cured the pain of a scorpion sting. Another account tells of a Jyotishi Buwa who was also cured of a severe scorpion sting by applying Udi and chanting Baba's name, which solidified his faith.