An old man in Heoborea begged for your aid for his ill grandchild. With Rahyeh’s constant attacks, no one could gather ingredients for a cure.
You gathered the various ingredients the old man described and brought them to him.
Upon delivering them, he admitted that he had lied to you. He has no grandchild, he desired the ingredients for another purpose. You were able to abscond before he could continue describing their actual use.