I'm not exactly how this kind of idea would turn out, but how about this? Once every month or so, levels of the Cradle intersect with each other, and a huge division war begins between different families, such as the Snarbolax and the beast families, Vanaduke and his empire, JK and the other jellies, the gremlins and their constructs, and the Spiral Knights. Whenever there is a war between opposite divisions, we can choose which side to fight for, like a lockdown fight, except with monsters included.

If you join a specific division, you'll be rewarded with a badge accessory with their emblem, but as you fight through, you can rank up based on how well you fight, and your xp can multiply with each winning streak. As you rank up, you can get different kinds of accessories, like the Snarbolax's eyes, Vanaduke's cape, a glowing necklace in the shape of JK's core, etc.

A war can last up to a week, and on the final day, a winning division is declared by the number of victories over the losing side. After the side is declared, the rest of the levels are affected by the war based on the winning side for the rest of the month. For example, if there was a war with JK and the Snarbolax, and the JK division won, then the slimes in his level could look more aristocratic and filled with more crowns. As for the Snarbolax division, the forests could be war torn and covered in slime, and there would be all kinds of random environmental "accidents."

Anyway, that's one of my many ideas. I hope this sparks a few ideas for the Three Rings team, and I hope that more of my ideas will be put into play someday.