Mictlan

[Fate]

What about making higher level summons require more than 1 command slot? Is that possible? It would make sense, as those monsters would take more concentration to control...

Another possibility is making some national troops specifically designed for late game (higher Magic Resistance, maybe some special abilities...) , but their stats & higher cost make them useless vs. early game indies.

A final possibility is making buffs that affect only recruited troops, but not summoned ones.