This is a suggestion i have for a mutation. What does it do? The Biomass mutation has a similar effect to the tree mutation, but instead of growing from the human's neck, it grows from it's legs and it expands in a 30 meters radius, After the legs are fully grown, the rest of the body grows like the serpent mutation.
After the mutation is complete, the biomass will act like a land mine, when someone steps on it, the biomass will launch biomass mutation liquid to them, like a gorse.