Another balancing idea, this time for Persians: give Persians a unique tech that makes converted elephants turn into Gaia.

This way, if you send an elephant into combat and it gets converted, it will start attacking every unit like a wolf would.

Maybe this is unbalanced, but I feel like it would make gameplay a little more realistic. If you can send 5 elephants into your enemies economy, there will be certain consequences.

A good name for the tech: "Stampede"