New World quest Weakness of the Ego has some extra steps required that may have some players confused on where to begin.
Weakness of the Ego New World: How to Complete Quest
Weakness of the Ego requires the player to collect three water, three Petalcaps, and three Rivercress Stems to craft three Corruption Tinctures at an Arcane Station/Repository.
The struggle many players are having with Weakness of the Ego comes from collecting the Rivercress Stems. Rivercress Stems require a harvesting skill of 30, something you likely do not have at this point in the game, unless you went out of your way to collect some resources just because you wanted to.
To quickly level your harvesting skill, head to the river directly below Eldergate at Millberry Hills and begin to harvest crops by the river with your sickle to level up your harvesting skill.
The three water can be bought from just about any vendor, and the three Petalcaps will be picked up from the same location mentioned above - keep an eye out for "Fronded Petalcaps." You should have no trouble collecting the Petalcaps, leveling your harvesting skill in the process in order to pick up the Rivercress Stems.
How to Craft Corruption Tinctures
Once you have the water, Petalcaps, and Rivercress Stems, head into town and seek out the Syndicate Alchemist, the Faction Representative for the Syndicate. Next to the Syndicate Alchemist on your map will be the Arcane Repository, where the Corruption Tinctures can be crafted.
Head into the Arcane Repository menu and you will see "Common Corruption Tincture" under the Concoctions tab, then under the Resistance Consumables tab. Craft three of the tinctures and you can now hand in the quest for completion!