Very simple, I just want an increased chance of rarities coming out of Treasure Boxes. Because, quite honestly, in the whole time I have played Spiral Knights as of December 20, 2014, only one Advanced Orb had dropped for me. Yup. Now back to the increased chance. This will make farming for rarities easier, I know, so I also wanted to make farming much more harder. It's simple: Just make a Rank Mission only playable for a few amount of times per day. Or, once it's finished, you may not play it anymore. I would prefer the first method I mentioned to reduce farming.

Also, I thought of treasure boxes dropping energy as a bonus. Once it does drop, then it would be a Useable, and may be collected in the Clockworks. When using this Useable, you will get some Scrap Metal, some Bronze Bolts, and some amount of energy. The Materials you collect would be the empty tank, which could be repurposed via crafting.