Obtained from the bulletin board in the fishing village, this side-quest has you gathering pieces of dulse from the Lake of the Drowned.
You first task is to search the area marked on the map for five (x5) dulse - which is a plant found under water - like at the bottom. So head to the water and dive in - no worries mates you can hold your breath good!
Once you have the plants return to the quest marker and turn in the plants to get the Sophia's Healing Recipe Blueprint - which allows you to create Medkits from algae.