Dao Yuting's growth has always been guided by her personal master Wang Lin, who arranged for all her opportunities, magic items and elixirs.
The Gui Water Ice Saber was the only magic treasure given to her by Lin Feng. It was her reward for being the first person among the second-generation Direct Disciples to achieve the Immortal Soul Stage.
This magic treasure originated from the Freshwater Holy Man whom Lin Feng defeated years ago. He occupied Mount Liubo of the East Sea after the Flowing Waves Holy Man left, and began crafting a magic treasure. But when he was a step away from succeeding, the Kui Cow King brought Lin Feng and the others back to Mount Liubo and chanced upon the Freshwater Holy Man's plan.
After that, the Spiritual Sea Horse King and his tribe were saved while the Freshwater Holy Man was restrained. The magic treasure he was crafting naturally fell into Lin Feng's possession.