Knowledge skills
The next skill tree branch - knowledge branch - contains everything related to experience, skills, and blueprints. For instance, it is there you can find skills, unlocking additional active skill slots, what makes it quite important. And the skills that affect the experience gained are also very useful. To be honest, maybe some of them even turned out to be too overpowered, and later, while working on game balance, I'll have to nerf them one way or another.
There is also an active skill increasing the experience gained for a short time - I think it will be useful if you need some extra levels before the story challenges insuperable so far.
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