There are multiple ways to get different buffs in Once Human, and Whim Potions are an easy way to gain temporary advantages aiding you with combat and even traversal, making your life easier.
The Whim Potions in Once Human are easy to craft once you have the right Deviants in your base, and they passively produce materials for you. One of the season goals requires players to use a Whim Potion, but the game doesn’t make it obvious for you to identify and manufacture these items to use them to your advantage.