An old man in Heoborea begged for your aid, telling you of his ill grandchild and how no one can gather ingredients for a cure due to Rahyeh's attacks.
You gathered the various ingredients the old man described and brought them to the old man.
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.