To get your new opponent, follow the guide and thread here. This is what I have for Kaia's stats so far. Keep in mind, she has some POWERFUL weaponry. If you can't beat her outright, don't be shy about using the "Throw Pillows" strategy. Also, I do NOT know the stats of her "Ruby Ring". Not what it's actual name is as of yet, nor what it does. I've only seen it once and it didn't seem to do anything that one time. If anyone knows, it's full name or it's stats, please post here or PM me.