In Once Human, the Festering Gel Deviant is a powerful ally that you’ll want to obtain early in the game. This guide will walk you through the steps to acquire this essential companion, which not only provides valuable defensive capabilities but also boosts your health and sanity during combat.

Step 1: Progress Through the Main Story
To begin your journey toward obtaining the Festering Gel Deviant, you must progress through the main storyline of Once Human. Specifically, you need to complete the “Welcome Back” story quest. This quest will eventually lead you to a critical location: the Monolith of Greed, found in the Dayton Wetlands.
Step 2: Locate the Monolith of Greed
After completing the “Welcome Back” quest, your next task is to locate the Monolith of Greed. This area is vital for triggering the boss fight that will eventually reward you with the Festering Gel Deviant. The Monolith of Greed is marked on your map once you activate at least five Rift Anchors scattered throughout the Dayton Wetlands​.
Step 3: Activate the Rift Beacon
Once you arrive at the Monolith of Greed, you need to interact with the Rift Beacon. This action will initiate the boss fight with the Ravenous Hunter, also known as the Foul Shadowhunter. Make sure your character is well-prepared, as this is your first major boss fight in the game. It’s recommended that you bring plenty of ammo and ensure your character’s level is high enough to handle the challenge​.
Step 4: Defeat the Ravenous Hunter
The battle against the Ravenous Hunter is straightforward but requires some strategy. The key to defeating this boss lies in depleting its health while managing its temporary immunity phases. During these phases, you’ll need to destroy the orbs that appear on either side of the boss to remove its immunity. Continue to repeat this process until the Ravenous Hunter is defeated​.
Step 5: Capture the Festering Gel Deviant
Once the Ravenous Hunter is defeated, the Festering Gel Deviant will spawn in the area. You can then capture this Deviant, adding it to your collection. The Festering Gel Deviant is particularly valuable due to its unique abilities that can significantly enhance your combat effectiveness​.
How to Use Festering Gel in Combat
After capturing the Festering Gel Deviant, you can utilize its abilities in battle. This Deviant specializes in creating defensive barriers and healing both health and sanity. Here are the two primary abilities:
- Build Fortification: This ability allows the Festering Gel to form a barrier that you and your allies can use for cover. While behind the barrier, you gain additional health and sanity, making it an excellent defensive tool in prolonged battles.
- Flawless Fortification: This ability lets you throw the Festering Gel at enemies, knocking them back and creating a protective wall where it lands. This wall offers similar defensive benefits as the Build Fortification, but it can be used more aggressively by disrupting enemy formations​.
Acquiring the Festering Gel Deviant in Once Human is a crucial step in building a strong defensive strategy for your character. By following the steps outlined above, you’ll not only gain a valuable ally but also enhance your overall combat capabilities. Whether you’re defending against hordes of enemies or providing support to your allies, the Festering Gel Deviant’s abilities make it an indispensable part of your toolkit.
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