Weakness of the Ego quest tasks you with finding Petalcaps and Rivercress. This guide on Where To Find Petalcap & Rivercress Stem In New World will tell you exactly where to find both items so you can harvest all of the resources you need to complete the quest and continue with the story.
Article – https://www.gamersheroes.com/game-guides/where-to-find-petalcap-rivercress-stem-in-new-world/
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