Let the World Change Your Mutations
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The official description gives BIOMUTANT two mutation paths: bio-contamination out in the world leading to mutations like Turtleform and Mucus Bubble, and radioactivity in old-world bunkers unlocking psi-mutations such as telekinesis and levitation.
Two exposures, two families
Physical mutations come from the living world, and psi-mutations come from the ruins of the old one. Since they are sourced separately, the places you choose to explore shape the character you end up with, which makes route choice a build decision.
Re-coding changes more than looks
The store says you can re-code your genetic structure to change the way you look and play, and that this affects your attributes. That is the clearest statement that appearance and capability are the same dial here.
Powers sit inside the combat mix
Mutations are not a separate mode: they are the third ingredient alongside melee and shooting in the martial arts combat system. A build that leans on powers still has to move, because freedom of movement is the base the publisher describes.
Powers are one third of the fight, so read learning the Wung-Fu forms. And match your gear to the environment in crafting and packing.