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I agree, Zubr. In parts 1-3, there was a normal, traditional skill system. In part 4, they complicated it a bit, but essentially it remained the same. In part 5, they created a rather original system of special abilities and dependencies of some skills on others, which is a big plus for them. In part 6, they simply took and mindlessly copied the RPG system of development, which heroes need as much as an elephant needs a trumpet.