I have read people say about skill trees and I think that would be cool. So I had an I an idea if skill trees are too much why not give a different skill depending on what points you have set. Its about mixing the three class points and I think it woutld be an awesome addition and everyone wouldn't have the same skills and therefore be different offering greater customization.
Eg.

Say we have 30 points to set

Str 10
Dex 10
Int 10

You would learn a new skill
But
If you set

Str 15
Dex 10
Int 5

You would get a different skill based on your configuration of points.

Its kinda hard to explain lol

What do you guys think?

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