I have an idea. The thing would be where Generals have access to tech trees, giving them access to more powerful units, upgrading units and his own powers. However, the Assasin would have a Talent tree, allowing him to upgrade his powers, give him new powers, and upgrade units. It would be like this:

Tech Tree: Focus on Units, unit upgrades, more units, etc.

Talent Tree: Focus on Demigod upgrades, new powers, upgrades to powers, etc.

Even though the Tech tree focuses on units, it still has access to Demigod upgrades, but they're just not as powerful, and they increase different things (sending Demigod into battle increases troop fighting ability?). The same goes for the Talent tree. Although it focuses on Demigod upgrades, there are some unit techs too.

What do you think of my idea?