Cactus Sap is gathered by harvesting cacti, with a hatchet being more reliable than a whip; wyverns and crystal wyverns can also collect it efficiently using their wing flap. Consuming it restores food but does not hydrate you, though larger cacti may provide water when struck. It can be used to make Cactus Broth and is found in scorched cactus patches, including near the tar pits on Fjordur’s Volcano island.