Arclight Rumble handles variety between crusade missions all around ok, giving 65 novel battles, with every Leader flaunting a completely unique trick. Pioneers have their own guides, and players some of the time need
https://playarclightrumble.net/ to stir their technique up to overcome them. I've had what was going on where my level 12 units went facing a level 8 Leader, yet my reckless certainty brought about the foe overwhelming me and assuming command.