I prefer it to be completely triggered by the player. Some people play fast and I'd prefer not to waste hours clicking on end turn after end turn just to be able to use Marian units. The problem right now is that Imperial Palace is too easy to get to after Pro-consul's Palace and it just happens too early. Something like requiring 2 Imperial Palace level buildings might be better. That's likely going to add more than 10 turns, at the least.
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