Balance Concerns:
Mention any balance concerns you have.
I'll start with the unit Immortal, the Persian UU. Advantages over the standard chariot - it requires only animal husbandry not chariotry, it costs 20 hammers not 25, it receives defensive bonuses, it gets +50% vs archers, I think it may have +1 possible first strikes too can't remember. Overall its simply too good and I think it shouldn't receive defensive bonuses or the cost should go up.
Mention any balance concerns you have.
I'll start with the unit Immortal, the Persian UU. Advantages over the standard chariot - it requires only animal husbandry not chariotry, it costs 20 hammers not 25, it receives defensive bonuses, it gets +50% vs archers, I think it may have +1 possible first strikes too can't remember. Overall its simply too good and I think it shouldn't receive defensive bonuses or the cost should go up.