So, in this objective random crusaders fall asleep every 25 levels, and they do not contribute DPS or buffs of any sort (though, for some misterious reason, you can still use the skill they unlock...). The problem, which I discovered by accident, is that if you refresh the game, every crusader is awake, and they stay awake until the next 25th-level milestone is reached. Basically, refreshing the game a few times turns the objective into "reach level 250", with no other special rules.