A few really cool ideas I've had are objects like rogue Comets coming into the Juno system, some as large as planets, all procedural , some binary.
Then to go off of that exact same feature you could have a Droo Extinction Level Moment. Where a rogue body is headed towards droo.
Your goal is to use "unlimited funds" from the governments of droo to create either one single huge explosion, or a series of smaller explosions on the same quarter of the "rouge". You could set the size of the object as it's difficulty level. Requiring more "explosive power" to change its trajectory.
@SomberlySober, yes, you could do that, but i found a huge difference in landscape programming and craft programming. That’s why one can’t divert any asteroids now, even with a huge engine. I can see the same problem plaguing the randomly generated comets, making it impossible for them to be deflected. Goodbye Droo!