The medicine he gives them is made from specific herbs in a garden in the forest. Lately, one of Lord Iorworth's men declared that RS gold he was taking the garden. Your mission (for this part of component 3) would be to beat him up, harvest the herbs, replant the garden someplace, and burn the area down thus Iorworth's group of"investigators" can't use the herbs to make new potions. You're given 2 pouches and a pair of instructions. Follow them for to the backyard. Conquer the elf warrior to receive a rake and spade.
Harvest the herbs and Eluned will appear to aid you. Give her the pouch together with the herbs, along with a she will take some pots and OSRS buy gold replant the herbs. A cutscene will start with the fire spreading. Cast the water spell and it will die. Go with Eluned.