Just recently finished a playthrough as the Britannian Empire (Langenburg) and I'm quite saddened how there's just... no actual "challenging" nations to fight anymore. I know that the focus tree's the playthrough itself, and I really enjoyed it (wished it has more) but I wanted to thoroughly test my end-game nation and end it in a sort of "wars to end all wars" fashion.

I don't like giving bonuses to AI nations so what Unifiers and AI behavior combinations are the strongest? (Hopefully most of them are evil ones)

-Event Rules-

I'm eyeing the Zetan invasion but I assume they'll spawn at the start? If so, would be wonderful if there's like an event code so I can spawn them in the late game. For the others, please recommend me evil ones! :>