I think if abilities could be combined, it would be greater. Let me explain, abilities just can improving to level 10. If you played 1 month, you would improved all skills and you will not have any different ability. But we can combine two abilities in same category -like passive with passive or utility with utility- when two of them max levels, it will be more effected. But it should be challenged. The combination of two abilities should last for 100 hours and 50.000 gold. And the new skill start to level 1. But new skill(combined product) had contain all properties of initial abilities.
