THE WITCHER 3: WILD HUNT
78 Achievements
Mutant
Fill all mutagen slots.
How to unlock the Mutant achievement in THE WITCHER 3: WILD HUNT - Definitive Guide
The mutagens that you put in the slots can be found on the bodies of your enemies and can also be crafted in the alchemy menu.
Matching the skills that are placed in the three squares to the colour of the mutagen that you have slotted into that area will also increase the power of said mutagen (I.e. a 10% sign intensity mutagen will increase to 40% if three matching colour skills are slotted next to it.
Mutagens come in three categories, Red/Bue/Green which benefit Combat/Sign/Alchemy respectivly. They drop from monsters around the world.
In order to actually unlock all mutagen slots, you will need to reach Level 28. Once you are of this level, you'll unlock the fourth mutagen slot and can finally fill it with a mutagen of your choosing. For those unfamiliar, mutagens are rare organic ingredients that be obtained from the remains of defeated monsters. These mutagens can then be equipped in the Character Panel to increase attack power (red mutagen), Sign intensity (blue mutagen), and even Vitality (green mutagen).
There are two types of mutagens in the game: lesser and greater. The Lesser mutagens can be found most commonly on any monster of the wild; this includes Nekkers, Hags, Wraiths, Harpies, and more. The greater mutagens are found on more unique monsters in the game however, such as contracted monsters. With this in mind, just be sure to always loot your enemies/opponents and more often than not, you'll be lucky enough to find a mutagen on their corpse. Whether you equip lesser or greater mutagens in the four slots of the Character Panel, this achievement will unlock once all four slots are filled.
When you reach level 28, you will have all four mutagen slots unlocked. By that time, you should have amassed more than enough mutagens from defeating monsters to fill all four slots. Equip any four mutagens in each slot and the trophy will unlock.
The last cell opens at level 28 of our hero.
It is enough to install any mutagens in these cells, of which we will have a huge amount at some point.